Glossary · Nouns · O
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TermTypeDefinitionClassificationsUpdated
Oceanautnouna skilled worker who can live in underwater installations and participate in scientific researchverified
Oceanographynounthe branch of science dealing with physical and biological aspects of the oceansverified
Oceanologynounthe branch of science dealing with physical and biological aspects of the oceansverified
Ocelotnounnocturnal wildcat of Central America and South America having a dark-spotted buff-brown coatverified
Ochna FamilynounMWEfamily of tropical evergreen trees and shrubs with thick shining parallel-veined leavesverified
Oconee BellsnounMWEplant of southeastern United States having solitary white funnel-shaped flowers flushed with pink and large glossy green leaves that turn bronze-red in fallverified
Ocotillonoundesert shrub of southwestern United States and Mexico having slender naked spiny branches that after the rainy season put forth foliage and clusters of red flowersverified
Octal NotationnounMWEany mathematical notation that uses 8 different characters (usually the digits 0 to 7)verified
Octal Number SystemnounMWEa positional system of numeration that uses octal digits and a radix of eightverified
Octal Numeration SystemnounMWEa positional system of numeration that uses octal digits and a radix of eightverified
Octanenounany isomeric saturated hydrocarbon found in petroleum and used as a fuel and solventverified
Octavonounthe size of a book whose pages are made by folding a sheet of paper three times to form eight leavesverified
Oculistnouna person skilled in testing for defects of vision in order to prescribe corrective glassesverified
Oculopharyngeal Muscular DystrophynounMWEa form of muscular dystrophy that usually begins between early adulthood and middle age and first affects muscles of the eyelid and throatverified
Odd-Leg CalipernounMWEcaliper having the points on its legs both curve in the same directionverified
Odd-Toed UngulatenounMWEplacental mammals having hooves with an odd number of toes on each footverified
Odds-Makernounsomeone who sets the betting odds based on calculations of the outcome of a contest (especially a horse race)verified
Odontoglossumnounany of numerous and diverse orchids of the genus Odontoglossum having racemes of few to many showy usually large flowers in many colorsverified
Odontologynounthe branch of medicine dealing with the anatomy and development and diseases of the teethverified
Odornounthe sensation that results when olfactory receptors in the nose are stimulated by particular chemicals in gaseous formverified
Odournounthe sensation that results when olfactory receptors in the nose are stimulated by particular chemicals in gaseous formverified
Oecumenismnouna movement promoting union between religions (especially between Christian churches)verified
Oedemanounswelling from excessive accumulation of watery fluid in cells, tissues, or serous cavitiesverified
Oesophageal VeinsnounMWEsmall veins from the esophagus emptying into the brachiocephalic vein or the azygos veinsverified
Oesophagogastric JunctionnounMWEthe junction between the esophagus and the stomach epitheliumverified