origin-o: origin (cf. fonto); -ala: original: 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: (
orikterop-o: (2001) aardvark, ant bear (Orycteropus afer of the order Tubulidentata). — FI
oriol-o: (
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: (
orl-ar: (
orn-ar: (
ornament-o: ornament, embellishment; (
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: (
ort-a: right (angle); (cf. rekta); -o: a right angle; -e: at a right angle; -angula: orthogonal, rectangular.
ortocentr-o: (
ortodox-a: (
ortogenez-o: (
ortogon-o: (
ortografi-o: orthography (cf. espel-ado); kulpo -ala: mistake in spelling. — DEFIRS
ortografik-a: (
ortokrom-a: (
ortolan-o: (
ortopedi-o: (
ortopter-o: orthopterous insect. — DEFIS
ortoptik-a: (
orvet-o: orvet: blind-worm, slow-worm (Anguis fragilis). — EF
orvietan-o: orvietan: a pretended antidote or counter-poison. — DEFIS
osifrag-o: (
oskul-ar: (
osmi-o: (
osmos-o: (
ost-o: bone; -eto: small bone, ossicle; -ala, -oza: osseous, bony; (
ostegom-o: (
ostensori-o: (
ostent-ar: (
osteoblast-o: (
osteologi-o: osteology. — DEFIRS
osteom-o:
osteopati-o: (2001) osteopathy. — DEFIRS
osteoplasti-o: (2001) osteoplasty. — DEFIRS
ostit-o: (
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: (