order Rajiformes
— Noun
– English
～ fish with dorsoventrally flattened bodies; includes: rays; skates; guitarfishes; sawfishes
order Ranales
— Noun
– English
～ herbs, shrubs and trees: includes families Ranunculaceae; Annonaceae; Berberidaceae; Magnoliaceae; Menispermaceae; Myristicaceae; Nymphaeaceae; Lardizabalaceae; Lauraceae; Calycanthaceae; Ceratophyllaceae; Cercidiphyllaceae
omnidirectional range
— Noun
– English
～ a navigational system consisting of a network of radio beacons that provide aircraft with information about exact position and bearing
omnidirectional radio range
— Noun
– English
～ a navigational system consisting of a network of radio beacons that provide aircraft with information about exact position and bearing
order Ranunculales
— Noun
– English
～ herbs, shrubs and trees: includes families Ranunculaceae; Annonaceae; Berberidaceae; Magnoliaceae; Menispermaceae; Myristicaceae; Nymphaeaceae; Lardizabalaceae; Lauraceae; Calycanthaceae; Ceratophyllaceae; Cercidiphyllaceae
order Raptores
— Noun
– English
～ term used in former classifications; erroneously grouped together birds of the orders Falconiformes and Strigiformes
opossum rat
— Noun
– English
～ terrestrial marsupials of southern South America that resemble shrews
Ord kangaroo rat
— Noun
– English
～ most widely distributed kangaroo rat: plains and mountain areas of central and western United States
occupancy rate
— Noun
– English
～ the percentage of all rental units (as in hotels) are occupied or rented at a given time
octane rating
— Noun
– English
～ a measure of the antiknock properties of gasoline
Ockham's Razor
— Noun
– English
～ the principle that entities should not be multiplied needlessly; the simplest of two competing theories is to be preferred
Occam's Razor
— Noun
– English
～ the principle that entities should not be multiplied needlessly; the simplest of two competing theories is to be preferred
out of reach
— Adjective
– English
～ inaccessibly located or situated; "an unapproachable chalet high in the mountains"; "an unreachable canyon"; "the unreachable stars"
oven-ready
— Adjective
– English
～ prepared before sale and ready to be cooked
object recognition
— Noun
– English
～ the visual perception of familiar objects
orange red
— Noun
– English
～ a variable color that is vivid red but sometimes with an orange tinge
oxblood red
— Noun
– English
～ a dark brownish-red color
orange-red
— Adjective
– English
～ of red tinged with orange
orangish-red
— Adjective
– English
～ of red tinged with orange
oxidation-reduction
— Noun
– English
～ a reversible chemical reaction in which one reaction is an oxidation and the reverse is a reduction