follow Dictionary.com

Stories We Like: Novels For Language Lovers

-in1

1.
a suffix, occurring in adjectives of Greek and Latin origin, meaning “pertaining to,” and (in nouns thence derived) also imitated in English (coffin; cousin , etc.).
Origin
Middle English -in, -ine < Old French < Latin -inus, -ina, -inum < Greek -inos, -inē, -inon

-in2

1.
a noun suffix used in a special manner in chemical and mineralogical nomenclature (glycerin; acetin , etc.). In spelling, usage wavers between -in and -ine. In chemistry a certain distinction of use is attempted, basic substances having the termination -ine rather than -in (aconitine; aniline , etc.), and -in being restricted to certain neutral compounds, glycerides, glucosides, and proteids (albumin; palmitin , etc.), but this distinction is not always observed.
Origin
< Neo-Latin -ina. See -ine2

-in3

1.
a suffixal use of the adverb in, extracted from sit-in, forming compound nouns, usually from verbs, referring to organized protests through or in support of the named activity (kneel-in; chain-in; be-in) or, more generally, to any organized social or cultural activity (cook-in; sing-in).
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source
British Dictionary definitions for -in

-in

suffix
1.
indicating a neutral organic compound, including proteins, glucosides, and glycerides: insulin, digitoxin, tripalmitin
2.
indicating an enzyme in certain nonsystematic names: pepsin
3.
indicating a pharmaceutical substance: penicillin, riboflavin, aspirin
4.
indicating a chemical substance in certain nonsystematic names: coumarin
Word Origin
from New Latin -ina; compare -ine²
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Cite This Source
Word Origin and History for -in

suffix attached to a verb, first attested 1960 with sit-in (which probably was influenced by sit-down strike); used first of protests, extended c.1965 to any gathering.

chemical suffix, usually indicating a neutral substance, antibiotic, vitamin, or hormone; see -ine (2).

Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
-in in Medicine

-in suff.

  1. Neutral chemical compound: inulin.

  2. Pharmaceutical: rifampin.

  3. Antibiotic: penicillin.

  4. Antigen: tuberculin.

  5. Variant of -ine2.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source
Slang definitions & phrases for -in

-in

combining word

A communal occasion where one does what is indicated: be-in/ lie-in/ love-in/ pray-in (1960s+)


The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
Cite This Source

Word of the Day

Word Value for -in

0
0
Scrabble Words With Friends

Quotes with -in

Nearby words for -in