camera obscura
— Noun
– English
～ a darkened enclosure in which images of outside objects are projected through a small aperture or lens onto a facing surface
Carcharhinus obscurus
— Noun
– English
～ relatively slender blue-grey shark; nearly worldwide in tropical and temperate waters
ceremonial occasion
— Noun
– English
～ a formal event performed on a special occasion; "a ceremony commemorating Pearl Harbor"
Cassia occidentalis
— Noun
– English
～ very leafy malodorous tropical weedy shrub whose seeds have been used as an adulterant for coffee; sometimes classified in genus Cassia
Cercis occidentalis
— Noun
– English
～ shrub of western United States having pink or crimson flowers; often forms thickets
Celtis occidentalis
— Noun
– English
～ large deciduous shade tree of southern United States with small deep purple berries
Calycanthus occidentalis
— Noun
– English
～ straggling aromatic shrub of southwestern United States having fragrant brown flowers
coronary occlusion
— Noun
– English
～ occlusion of a coronary artery caused either by progressive atherosclerosis or by a blood clot
co-occur
— Verb
– English
～ go with, fall together
co-occurrence
— Noun
– English
～ an event or situation that happens at the same time as or in connection with another
co-occurrence
— Noun
– English
～ the temporal property of two things happening at the same time; "the interval determining the coincidence gate is adjustable"