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Ac
Symbol, Chemistry.
| actinium. |
ac
| Electricity. alternating current. |
ac-
| var. of ad- before c and qu: accede; acquire. |
A.C.
| 1. | Real Estate. air conditioning. |
| 2. | Electricity. alternating current. |
| 3. | before Christ. Origin: < L ante Christum  |
| 4. | Army Corps. |
| 5. | Athletic Club. |
a.c.
| 1. | Real Estate. air conditioning. |
| 2. | Electricity. alternating current. |
| 3. | (in prescriptions) before meals. |
Origin:
< L ante cibum
< L ante cibum
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Based on the Random House Dictionary, © Random House, Inc. 2009.
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|
Link To ac
| Ac 1 The symbol for the element actinium. |
| Ac 2 abbr. Bible Acts of the Apostles |
| AC abbr.
|
| a/c abbr.
|
ac·tin·i·um (āk-tĭn'ē-əm)  n. Symbol Ac1 A radioactive element found in uranium ores, used in equilibrium with its decay products as a source of alpha rays. Its longest lived isotope is Ac 227 with a half-life of 21.6 years. Atomic number 89; melting point 1,050°C; boiling point (estimated) 3,200°C; specific gravity (calculated) 10.07; valence 3. See Table at element. [From Greek aktīs, aktīn-, ray (from its radioactivity).] |
| Acts of the Apostles (ākts) pl.n. (used with a sing. verb) Abbr. Ac or AA See Table at Bible. |
| air conditioning n. Abbr. AC or a/c
|
| al·ter·nat·ing current (ôl'tər-nā'tĭng, āl'-) n. Abbr. AC An electric current that reverses direction in a circuit at regular intervals. |
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Main Entry: ac
Function: abbreviation
1 acute
2 [Latin ante cibum] before meals —used in writing prescriptions
Main Entry: Ac
Function: symbol
actinium
Main Entry: AC
Function: abbreviation
alternating current
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Language Translation for : ac
Spanish:
horquilla,
German:
die Haarnadel,
Japanese:
ヘアピン
ac abbr.
Latin ante cibum (before a meal)
Ac 1
The symbol for the element actinium.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source
| Ac
The symbol for actinium. |
| AC
Abbreviation of alternating current |
| actinium (āk-tĭn'ē-əm) Pronunciation Key
Symbol Ac A silvery-white, highly radioactive metallic element of the actinide series that is found in uranium ores. It is about 150 times more radioactive than radium and is used as a source of alpha rays and neutrons. Its most stable isotope has a half-life of about 22 years. Atomic number 89; melting point 1,050°C (1,922°F); boiling point (estimated) 3,200°C (5,792°F); specific gravity (calculated) 10.07; valence 3. See Periodic Table. |
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Ac
|
AC
|
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Ac
(Ac), radioactive chemical element, in Group IIIb of the periodic table, atomic number 89. Actinium was discovered (1899) by Andre-Louis Debierne in pitchblende residues left after Pierre and Marie Curie had extracted radium and was also discovered (1902) independently by Friedrich Otto Giesel. A ton of pitchblende ore contains about 0.15 mg of actinium. The rare, silvery-white metal is highly radioactive, glowing blue in the dark
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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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