Greek and Latin roots in English_I

Root Meaning in English Origin language Etymology (root origin) English examples
ichthy- fish Greek ἰχθύς (ichthus) ichthyology
icos- twenty Greek εἴκοσι (eikosi) icosagon, icosahedron
id- shape Greek εἶδος (eidos) idol
ide- idea; thought Greek ιδέα (idea) ideogram, ideology
idio- peculiarity Greek ἴδιος (idios) "private, personal, one's own" idiom, idiosyncrasy, idiosyncratic, idiot
ign- fire Latin ignis igneous, ignite, ignition
imagin- copy Latin imāgō, imāginis image, imagine
in- (1), il-, im- in, on Latin in illuminate, import, incur, intend, invite
in- (2), il-, im-, ir- not, un- (negation) Latin in- illicit, impossible, inimical, irrational
infra- below, under Latin infra infrastructure
insul- island Latin insula insular, insulation
inter- among, between Latin inter (preposition) intercollegiate, intermission, intersection
intra- within Latin intra intramural
irasc-, irat- be angry Latin irasci irascible, irate
irid- rainbow Latin iris iridescent
is-, iso- equal, same Greek ἴσος (isos) isometric, isomorphic, isotonic, isotropic
iter- again Latin iterum, iterare iteration
itiner- journey Latin iter, itineris itinerary