orific-o: orifice (cf. apert-uro, boko, truo). — EFIS
oriflam-o: oriflamme: ancient French banner. — DEFIS
origan-o: (bot.) origan: a majoram (genus: Origanum). — DEFIS
origin-o: origin (cf. fonto); -ala: originaclass="underline" relating to origin; not copied; (cf. stranja); -al-eso: originality; -al-ajo: (of things) the original, first copy; -al(ul)o: eccentric person, odd fellow; -e, -ale: originally, primitively; in the beginning, by origin. Ex.: Origino di vorti, di la mondo. Originala edituro, penso, pikturo. La pikturo montras originaleso. Kopiuro konforma a la originalajo. — DEFIRS
orikalk-o: (met.) orichalk. Def.: Anciena nomo di latuno. — DEFIS
oriol-o: (orni.) oriole (European: Oriolus galbula: golden oriole). — EF
oripel-o: tinsel; Dutch gold. Def.: Dina, oratra folieto, quan on uzas por orizar diversa objekti; VI-142. V. exp.: Or-pelikulo (E. gold leaf) esas vera oro; oripelo imitas l’oro; (kp. flitro); VI-142. — FI
orjat-o: orgeat: an almond syrup. — DeFIS
orkestr-o: orchestra: a part in theater (theatre) nearest the stage; a company of instrumental performers. — DEFIRS
orkide-o: (bot.) orchid — DEFIRS
orl-ar: (tr., needle-work) to hem: turn down and sew the edge of (a garment, fabric); -uro: hem; (arch., herald.) orlet, orle; (cf. ri-fald-ar, -uro). — FIS
orn-ar: (tr.) to adorn, embellish, bedeck (ulo, ulu, per ulo); (cf. dekorar, plu-bel-igar); -o: adorning; -ivo: adornment, ornament (cf. ornamento); -iva: decorative, ornamental. Ex.: La domi esas neta, komoda, ma li ne esas ornita. Ornar parko per statui. (fig.) Ca viri esas ornivi di nia yarcento. — eFIS
ornament-o: ornament, embellishment; (mus.) grace-note; (cf. orn-ivo); -ala: ornamental; -izar: to ornament, decorate (cf. ornar, dekorar); -o ek diamanti: diamond ornament. — DEFIS
ornitologi-o: ornithology. — DEFIRS
ornitopter-o: ornithopter: a flying machine propelled by flapping wings. — DEFIRS
orografi-o: orography: mountain physiography. — DEFIRS
orpiment-o: orpiment: arsenic trisulphide. — DEFIS
orsel-o: (bot.) archil, orchil, orseille.
ort-a: right (angle); (cf. rekta); -o: a right angle; -e: at a right angle; -angula: orthogonal, rectangular.
ortocentr-o*: (geom.) orthocenter.
ortodox-a: (rel. and fig.) orthodox; -eso: orthodoxy; -(ul)o: orthodox person. Ant.: heterodoxa. — DEFIRS
ortogenez-o*: (biol.) orthogenesis.
ortografi-o: orthography (cf. espel-ado); kulpo -ala: mistake in spelling. — DEFIRS
ortografik-a*: (geom.) orthographic. — DEFI
ortokrom-a*: (photog.) orthocromatic.
ortolan-o: (orni.) ortolan (Emberiza hortulana). — DEFIS
ortopedi-o: (surg.) orthopedics. Def.: L’arto qua korektigas o preventas deformaji di la korpo. — DEFIRS
ortopter-o: orthopterous insect. — DEFIS
orvet-o: orvet: blind-worm, slow-worm (Anguis fragilis). — eF
orvietan-o: orvietan: a pretended antidote or counter-poison. — DeFIS
osifrag-o: (orni.) ossifrage, osprey, sea-eagle. (Falco ossifragus). — EFI
oskul-ar*: (tr., intr., geom.) to osculate.
osmi-o*: (chem.) osmium. — DEFIRS
osmos-o: (physics) osmosis, osmose. — DEFS
ost-o: bone; -eto: small bone, ossicle; -ala, -oza: osseous, bony; (fig.) large-boned; -aro: bony frame-work (cf. skeleto); -igar: to ossify; -eskar: to become ossified; -if-ado, -esko: ossification; -o-karbono: bone-black; ludar per osteti: to play at knuckle-bones. — eFIS
ostensori-o: (R.C. rel.) ostensorium, monstrance. — DEFI
ostent-ar: (tr., intr.) to do a thing out of ostentation, show off, make a show (pri), parade (ulo); (fig.) to swagger; -anta, -oza, -ema: ostentatious. V. exp.: vid. fanfaronar. — EFIS
osteologi-o: osteology. — DEFIRS
osteom-o*: (med.) osteoma. — DE
ostit-o*: (med.) ostitis. — DEF
ostr-o: oyster; -o-strato, -eyo: oyster-bed; -kultiv(ad)o: oyster culture. — DeFIRS
ostracism-o: ostracism: banishment (cf. exil-ar). — DEFIRS
ostrogot-o*: Ostrogoth.
otalgi-o*: (med.) otalgia: ear-ache.
otari-o: otary: eared-seal. Def.: Speco di mar-hundo kun oreli; V-341. (Otariidae). — EFI
otit-o*: (med.) otitis; -o-interna: inflammation of the middle-ear. — EF
otolit-o*: (anat., zool.) otolith, ear-stone.
otoman-o: ottoman. Def.: Speco di divano; IV-395. — DEFIRS
otus-o: (vulgara) common owl, long-eared owl (Otus); -o penachet-oza: short-eared owl (Otus brachyotus, Asio accipitrinus, Strix brachyotus, Brachotus palustris). Def.: Noktala ucelo di qua la kapo esas ornita per penacheti quaze «oreleti»; IV-296. — L
ov-o: egg; -i: eggs; (of fish) roe; -o-shelo: egg-shell; -uyo: egg-cup, -holder; -ajo: an egg preparation; -ifar: to lay eggs; -o (mole o harde o mi-mole) koquita: boiled egg; -o sur plado: fried egg; -o mixita: scrambled egg; -o dispersita: poached egg; -vend-isto: egg-seller; -o-planto: egg-plant (Solanum ovigerum) (cf. berenjeno). — DeFIRS