oftalmi-o: ophthalmia. — DEFIS
oftalmologi-o*: ophthalmology.
oftalmoskop-o*: ophthalmoscope.
ogiv-o:
ogl-ar:
ogr-(ul)o: ogre. — DEFIS
ok: eight; -esma: (ordinal) eighth; -opla, -oplo: eight-fold, octuple; -imo: one-eighth; -a-dek: eighty, fourscore; -a-dek-yar-a, -o: octogenarian; -ima negro: octoroon: person one-eighth black; (cf. du). — eFIS
okarin-o:
okazion-o: occasion, opportunity; -e: occasionally, at times; -e di: apropos (of); (cf. kauzo). Ex.: Me kaptis la okaziono por parolar ad il. Kande okaziono prizentos su, ni iros. — EFIRS
okr-o: ochre; reda -o: red ochre. — DEFIRS
oktaedr-o*:
oktant-o: octant: eighth of a circle;
oktav-o:
oktilion-o*:
oktobr-o: October. — DEFIRS
oktogon-o*:
oktopod-o*: octopod (having eight legs); order Octopoda; (cf. polpo). — DEFIS
okul-o: eye; -eto: small eye;
okult-a: occult. V. exp.: vid. arkana. — DEFIS
okultac-o:
okup-ar:
ol: (abbr. for olu; acus. olun) (neuter pronoun referring to a definite object; cf. lo, lu) it; -i: they (cf. li); -ua: its; -ia: their (cf. lia). Ex.: Ol esas tre bela. La afero semblas bona, ma forsan ol ne esas tala. La kavalo esas tro fatigita; ol(u) ne povus tirar la veturo, La viri e la bestii ne konkordas inter su, nam ili (la viri) tiris ad-dextre, dum ke oli (la bestii) tiris adsinistre.
old-a:
ole-o: oil; -oza, -atra: oleaginous; -izar:
to oil (ulo); -ifar: to produce oil, give out oil; -uyo:
oil-holder, oilcan; cruet; -lampo: Argand lamp: common oil
lamp for illumination; -farbo: oil paint; -i santa:
olfakt-ar*:
oliban-o: olibanum: frankincense. — eFIS
oligark-o*: oligarch. — DEFIRS
oligarki-o: oligarchy. — DEFIRS
oligocen-o:
olim: formerly, in former times, once upon a time; -a: former; -a tempo: in days of old. Ex.: Olim esis kustumo. La homi di olima tempo. Olim ula princo regnis. Olima kustumo. — L
Olimp-o*: Olympus; -ano: a dweller in Olympus.
olimpiad-o: Olympiad: a period of four years. — DEFIRS
oliv-o:
ombr-o: shadow, shade; -izar: to shade, over shade; put in, cover with shadows; -oza, -iz-anta: shadowy, shady, umbrageous. — eFIS
oment-o*:
omis-ar*:
omlet-o: omelet. — DEFR