-idsuff. 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.-id 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]-id suffix forming adjectives, suffix forming nouns1. (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 -id?s suffix indicating offspring]-id 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, 2014id (?d) 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;