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Body; particle: chromatid.

[Latin -is, -id-, feminine patronymic suff., from Greek.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


suffix forming nouns
1. (Celestial Objects) indicating the names of meteor showers that appear to radiate from a specified constellation: Orionids (from Orion).
2. indicating a particle, body, or structure of a specified kind: energid.
[from Latin -id-, -is, from Greek, feminine suffix of origin]


suffix forming adjectives, suffix forming nouns
1. (Zoology) indicating members of a zoological family: cyprinid.
2. (Historical Terms) indicating members of a dynasty: Seleucid; Fatimid.
[from New Latin -idae or -ida, from Greek -idēs suffix indicating offspring]


suffix forming nouns
(Chemistry) a variant of -ide
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014



n. Psychoanal.
the part of the psyche that is the source of unconscious and instinctive impulses that seek satisfaction in accordance with the pleasure principle. Compare ego (def. 2), superego.
[1924; < Latin id it, as a translation of German Es literally, it]



n., pl. ID's, IDs
v., ID'd or IDed or ID'ed, ID'ing or ID•ing.
1. a means of identification, as a document containing information regarding the bearer's identity.
2. to identify.
3. to issue an ID to: Go to the admissions office if you haven't been ID'd yet.


1. Also, Id. Idaho.
2. Also, i.d. inside diameter.
3. (Iraq) dinar.


contraction of I would or I had.


a suffix of nouns that have the general sense “offspring of, descendant of,” occurring orig. in loanwords from Greek (Atreid; Nereid), and productive in English on the Greek model, esp. in names of dynasties, with the dynasty's founder as the base noun (Abbasid; Fatimid), and in names of periodic meteor showers, with the base noun usu. denoting the constellation or other celestial object in which the shower appears (Perseid).
[< Latin -id-, s. of -is < Greek]


a suffix occurring in English derivatives of modern Latin taxonomic names, esp. zoological families and classes; such derivatives are usu. nouns denoting a single member of the taxon or adjectives with the sense “pertaining to” the taxon: arachnid; canid.
[< Greek -idēs]


var. of -ide: lipid.


a suffix occurring in descriptive adjectives borrowed from Latin, often corresponding to nouns ending in -or1: humid; pallid.
[< Latin -idus]




1. identification.
2. identity.
3. Intelligence Department.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.