ontologi-o: (philos.) ontology. — DEFIRS
onyon-o: (plant and edible bulb) onion; -eyo: onion-bed; -shelo: onion-skin, -peel. — EF
oocit-o: (biol.) oocyte. — DEFIRS
oogenez-o: (biol.) oogenesis. — DEFIRS
oogoni-o: (biol.) oogonium.
oolit-o: (geol.) oolite. — DEFIRS
oosfer-o: (biol.) oosphere.
oospor-o: (bot.) oospore.
-op-: (suffix) Sufixo distributala, kun nomi di nombro o di quanto. Ex.: du-opla: double; tri-opla: triple.
opak-a: opaque. Def.: Qua ne esas diafana, ne permeebla per lumo. Ant.: diafana, translucida. — DEFIS
opal-o: (min.) opal; -vitro: (fig.) opal (or, iridescent) glass. — DEFIRS
opalec-ar: (intr.) to opalesce. — DEFIS
oper-o: opera; -eto: operetta; -o-teatro: opera house. — DEFIRS
operac-ar: (tr., surg., mil., math., finan.) to operate (upon); -ato, -ito: person operated upon; -ar malado, tumoro: to operate upon a sick person, a tumor. Ex.: Subisar operaco. Financalo operaco. Operaco en sustraciono. Militala operaco. — DEFIRS
operkul-o: (bot., anat., zool.) operculum (cover, lid). — EFIS
opiat-o: (med.) opiate. — DEFIS
opinion-ar: (tr.) to opine, express one’s opinion, be of the opinion. Def.: Expresar judiko pri temo. Ex.: Me favore opinionas pri la projeto. Publika opiniono. — EFIS
opium-o: opium; -oza: containing opium. — DEFIRS
-opl-: (suffix) multiplicatory suffix.
opodeldok-o: (med.) opodeldoc. — DEFI
oport-ar, -as: (intr., impersonal) it is required, it is necessary (ke); (cf. suffix: -end-); oportas levar ni fru morge: it is necessary to get up early to-morrow. V. exp.: Kande ica signifiko havas subjekto, on uzas mustar: oportas ke vu departez: vu mustas departar. — L
oportun-a: (of things) opportune, seasonable, timely, convenient (cf. favor-oza); -eso: opportuneness (cf. okaziono); -ismo: (politics) opportunism; -isto: opportunist; (N.B. «opportunity» is translated byokaziono or oportunajo); Ex.: Okaziono oportuna. Oportuneso di la sokurso. — DEFIS
opoz-ar: (tr.) to oppose (ulu ad ulo, ulu, ad ulu), to put in opposition to, place (ulo) opposite; -(ad)o: opposition (resistance); -eso: opposition (contrast, state of); -anto, -ero: opponent; -ata, -ita: opposed, opposite (ad); -ant-aro: the opposition; -ato: the opposite; -ar spegulo a la fenestro: to set a glass opposite a window; -ar digo a la torento: to oppose a dike (dyke) to a torrent; -ar du motivi: to put two motives in contrast; la domo opozata: the house opposite. (N.B. the basic idea of this word implies putting in contrast, opposing an obstacle, rather than active opposition, therefore, «to oppose»: act in opposition, is translated ordinarily by kombatar, rezistar). — DEFIRS
opres-ar: (tr., phys., mental, social) to oppress: to lie heavy on; deject, treat with hardship; (cf. charj-egar, pres-egar); Def.: Presar forte (fizike o etikale) kontre ulu. V. exp.: On esas fizike opresata, kande on respiras kun peno; on esas etikale opresata, kande on angoras pro desquieteso, en expekto di trista evento od informo. La richuli opresas la povruli. La konquestiti povas esar opresata da la konquestanti, la laboristi da la patroni, e.c. III-223. — EFIS
optativ-o: (gram.) optative. — DEFIS
optik-o: (science of) optics; -isto: optician: one skilled in optics (cf. okul-isto). — DEFIRS
optim-ismo: optimism; -isto, -ista: optimist(ic). — DEFIRS
optimiz-ar*: to optimize (optimise): to make as perfect, effective, or functional as possible. — EF
optometri-o: (2001) optometry. — DEFIRS
or: (conj.) now, but (in argument). V. exp.: Or expresas ne nur intersequo di du propozicioni, ma induktas nova argumento, plusa premiso, expliko, motivo. Ex.: Or, vua argumento semblas bona, ma ... Omno qua foligas esas veneno; or l’alkoholo foligas; do ... Kande la premiso (motivo) sequas la konkluzo, or vicesas da nam; ex.: L’alkoholo esas venono, nam ol foligas; kp. nam; VI-141-2; Talmey’s Text Book, p. 113. — FIS
-or: (gram.) future infinitive verb ending.
or-o: gold; -a: (of gold thread, watch, etc.); -ea: golden (of hair, etc.); -oza: full of, rich in gold, auriferous; -min-eyo: gold mine; -izar: to gild, plate (ulo) with gold; -folio, -pelik-ulo: gold leaf; -iz-ita-arjento: silver-gilt. — FIS
