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Dictionary.com Unabridged (v 1.1) - Cite This Source - Share This

ar·se·nic

Audio Help [n. ahr-suh-nik, ahrs-nik; adj. ahr-sen-ik] Pronunciation Key

–noun

1.	a grayish-white element having a metallic luster, vaporizing when heated, and forming poisonous compounds. Symbol: As; atomic weight: 74.92; atomic number: 33.

2.	arsenic trioxide.

3.	a mineral, the native element, occurring in white or gray masses.

–adjective arsenic

4.	of or containing arsenic, esp. in the pentavalent state.

[Origin: 1350–1400; ME arsenicum < L < Gk arsenikón orpiment, n. use of neut. of arsenikós virile (ársén male, strong + -ikos -ic), prob. alter. of Oriental word (perh. < *arznig, metathetic var. of Syriac zarnig) by folk etym.

]

Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.

Encyclopædia Britannica, Inc.
Arsenic

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American Heritage Dictionary - Cite This Source - Share This

ar·se·nic Audio Help (är'sə-nĭk) Pronunciation Key
n.

Symbol As A highly poisonous metallic element having three allotropic forms, yellow, black, and gray, of which the brittle, crystalline gray is the most common. Arsenic and its compounds are used in insecticides, weed killers, solid-state doping agents, and various alloys. Atomic number 33; atomic weight 74.922; valence 3, 5. Gray arsenic melts at 817°C (at 28 atm pressure), sublimes at 613°C, and has a specific gravity of 5.73. See Table at element.
Arsenic trioxide.

adj. ar·sen·ic (är-sěn'ĭk)
Of or containing arsenic, especially with valence 5.

[Middle English arsenik, from Old French, from Latin arsenicum, from Greek arsenikon, yellow orpiment, alteration of Syriac zarnīkā, from Middle Persian *zarnīk, from Old Iranian *zarna-, golden; see ghel-² in Indo-European roots.]

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The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.

Online Etymology Dictionary - Cite This Source - Share This
arsenic

c.1386, from O.Fr. arsenic, from L. arsenicum, from Gk. arsenikon "arsenic," adopted for Syriac (al) zarniqa "arsenic," from Middle Persian zarnik "gold-colored" (arsenic trisulphide has a lemon-yellow color). The Gk. word is folk etymology, from arsen "male, strong, virile" (cf. arseno-koites "lying with men" in N.T.) supposedly in reference to the powerful properties of the substance. The mineral (as opposed to the element) is properly orpiment, from L. auri pigmentum, so called because it was used to make golden dyes.

WordNet - Cite This Source - Share This

arsenic
noun
1.	a white powdered poisonous trioxide of arsenic; used in manufacturing glass and as a pesticide (rat poison) and weed killer
2.	a very poisonous metallic element that has three allotropic forms; arsenic and arsenic compounds are used as herbicides and insecticides and various alloys; found in arsenopyrite and orpiment and realgar

Kernerman English Multilingual Dictionary - Cite This Source - Share This
arsenic1 [aːsnik] noun

an element used to make certain poisons

Arabic:	مادَّة الزَرْنيخ
Chinese (Simplified):	砷
Chinese (Traditional):	砷
Czech:	arzen
Danish:	arsenik
Dutch:	arsenicum
Estonian:	arseen
Finnish:	arseeni
French:	arsenic
German:	das Arsen
Greek:	αρσενικό
Hungarian:	arzén
Icelandic:	arsenik
Indonesian:	warangan
Italian:	arsenico

Japanese:	砒素 (As)
Korean:	비소
Latvian:	arsēns
Lithuanian:	arsenas
Norwegian:	arsenikk
Polish:	arszenik
Portuguese (Brazil):	arsênico
Portuguese (Portugal):	arsénico
Romanian:	arsenic
Russian:	мышьяк
Slovak:	arzén
Slovenian:	arzen
Spanish:	arsénico
Swedish:	arsenik
Turkish:	arsenik

arsenic2 [aːsnik] noun

a poison made with arsenic

Arabic:	سُم الزَّرْنِيخ
Chinese (Simplified):	含砷制剂
Chinese (Traditional):	砒霜
Czech:	arzenik
Danish:	arsenik
Dutch:	arsenicum
Estonian:	arseenik
Finnish:	arsenikki
French:	arsenic
German:	das Arsen
Greek:	αρσενικό
Hungarian:	arzén
Icelandic:	arsenik
Indonesian:	racun dari warangan
Italian:	arsenico

Japanese:	砒素毒
Korean:	비소제
Latvian:	arsēns
Lithuanian:	arsenas
Norwegian:	arsenikk
Polish:	arszenik
Portuguese (Brazil):	arsênico
Portuguese (Portugal):	arsénico
Romanian:	arsenic
Russian:	мышьяк
Slovak:	arzenik
Slovenian:	arzenik
Spanish:	arsénico
Swedish:	arsenik
Turkish:	arsenik

The American Heritage Science Dictionary - Cite This Source - Share This

arsenic Audio Help (är'sə-nĭk) Pronunciation Key
Symbol As
A metalloid element most commonly occurring as a gray crystal, but also found as a yellow crystal and in other forms. Arsenic and its compounds are highly poisonous and are used to make insecticides, weed killers, and various alloys. Atomic number 33; atomic weight 74.922; valence 3, 5. Gray arsenic melts at 817°C (at 28 atm pressure), sublimes at 613°C, and has a specific gravity of 5.73. See Periodic Table.

The American Heritage® Science Dictionary
Copyright © 2002 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.

American Heritage Stedman's Medical Dictionary - Cite This Source - Share This

arsenic ar·se·nic (är'sə-nĭk)
n.
Symbol As
A poisonous metallic element having three allotropes, of which the gray form is the most common. Arsenic compounds are used in insecticides and solid-state doping agents. Atomic number 33; atomic weight 74.922; valence 3, 5. Gray arsenic melts at 817°C (at 28 atm pressure), sublimes at 614°C, and has a specific gravity of 5.73. adj. ar·sen·ic (är-sěn'ĭk)
Of or containing arsenic, especially with valence 5.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Merriam-Webster's Medical Dictionary - Cite This Source - Share This
Main Entry: ¹ar·se·nic
Pronunciation: 'ärs-nik, -^&n-ik
Function: noun
1 : a trivalent and pentavalentsolid poisonous element that is commonly metallic steel-gray, crystalline, and brittle —symbol As; —see

ELEMENT

table
2 : ARSENIC TRIOXIDE

Merriam-Webster's Medical Dictionary - Cite This Source - Share This
Main Entry: ²ar·sen·ic
Pronunciation: är-'sen-ik
Function: adjective
: of, relating to, or containing arsenic especially with avalence of five

Webster's Revised Unabridged Dictionary - Cite This Source - Share This

Arsenic

Ar"se*nic\ ([aum]r"s[-e]*n[i^]k; 277), n. [L. arsenicum, Gr. 'arseniko`n, 'arreniko`n, yellow orpiment, perh. fr. 'arseniko`s or better Attic 'arreniko`s masculine, 'a`rrhn male, on account of its strength, or fr. Per. zern[=i]kh: cf. F. arsenic.]

1. (Chem.) One of the elements, a solid substance resembling a metal in its physical properties, but in its chemical relations ranking with the nonmetals. It is of a steel-gray color and brilliant luster, though usually dull from tarnish. It is very brittle, and sublimes at 356[deg] Fahrenheit. It is sometimes found native, but usually combined with silver, cobalt, nickel, iron, antimony, or sulphur. Orpiment and realgar are two of its sulphur compounds, the first of which is the true arsenicum of the ancients. The element and its compounds are active poisons. Specific gravity from 5.7 to 5.9. Atomic weight 75. Symbol As.

2. (Com.) Arsenious oxide or arsenious anhydride; -- called also arsenious acid, white arsenic, and ratsbane.

Webster's Revised Unabridged Dictionary - Cite This Source - Share This

Arsenic

Ar*sen"ic\, a. (Chem.) Pertaining to, or derived from, arsenic; -- said of those compounds of arsenic in which this element has its highest equivalence; as, arsenic acid.

On-line Medical Dictionary - Cite This Source - Share This

arsenic

arsenic: in CancerWEB's On-line Medical Dictionary

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