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oceanarium a large public or commercial marine aquarium.
oceanaut an aquanaut.
ocean floor the surface of the ground at the bottom of the ocean.
ocean-going of, or designed or equipped for, travel on seas and oceans, as a ship. [2 definitions]
Oceania the central and southern Pacific islands collectively, including Melanesia, Micronesia, Polynesia, and sometimes Australia, New Zealand, and the Malay Archipelago; Oceanica.
oceanic of, pertaining to, or produced by the ocean. [2 definitions]
ocean liner a large commercial ship designed for travel on the open seas, which transports passengers or cargo, typically on a regular route.
oceanography the branch of science that deals with the geography and other features of oceans.
oceanology oceanography.
ocean sunfish any of a family of bony marine fishes, esp. a large, slow-moving, tropical species with a flattened body resembling an upright disk.
ocellus the small, simple eyespot that is common to many invertebrates, consisting of a retina, pigments, and nerve fibers. [2 definitions]
ocelot a spotted wild cat of Central and South America, similar to but smaller than a leopard.
ocher any of several iron oxides mixed with clay or sand, ranging in color from pale yellow to reddish brown, and used as pigments. [2 definitions]
ochlocracy government by a lawless crowd of people; mobocracy.
-ock small.
o'clock of or according to the clock. [2 definitions]
ocotillo a spiny shrub that resembles a cactus, found in the dry regions of Mexico and the southwestern United States.
OCS abbreviation of "Officer Candidate School."
Oct. abbreviation of "October," the tenth month of the Gregorian calendar year, having thirty-one days.
oct- a variant of octo-.
octa- a variant of octo-.