odd-pinnate
— Adjective
– English
～ (a leaf shape) pinnate with a single leaflet at the apex
organ pipe
— Noun
– English
～ the flues and stops on a pipe organ
oil pipeline
— Noun
– English
～ a pipeline used to transport oil
order Piperales
— Noun
– English
～ Piperaceae; Saururaceae; Chloranthaceae
os pisiforme
— Noun
– English
～ a small wrist bone that articulates only with the triquetral
orchestra pit
— Noun
– English
～ lowered area in front of a stage where an orchestra accompanies the performers
overhand pitch
— Noun
– English
～ a baseball pitch in which the hand moves above the shoulder
out of place
— Adjective
– English
～ of an inappropriate or misapplied nature
out of place
— Adverb
– English
～ in a setting where one is or feels inappropriate or incongruous; "he felt out of place in the lingerie shop"
open-plan
— Adjective
– English
～ (of rooms or buildings) having large rooms with few dividing partitions
openside plane
— Noun
– English
～ a woodworking plane designed to cut rabbets
oriental plane
— Noun
– English
～ large tree of southeastern Europe to Asia Minor
orbital plane
— Noun
– English
～ (astronomy) the plane on which a body is orbiting
outer planet
— Noun
– English
～ (astronomy) a major planet whose orbit is outside the asteroid belt (Jupiter, Saturn, Uranus, Neptune, Pluto)
ovulation method of family planning
— Noun
– English
～ natural family planning in which the fertile period is inferred from changes in the character and quantity of cervical mucus; ovulation is marked by an increase in mucus that becomes sticky and then clearer and slippery
onion plant
— Noun
– English
～ bulbous plant having hollow leaves cultivated worldwide for its rounded edible bulb
orchidaceous plant
— Noun
– English
～ any of numerous plants of the orchid family usually having flowers of unusual shapes and beautiful colors
okra plant
— Noun
– English
～ tall coarse annual of Old World tropics widely cultivated in southern United States and West Indies for its long mucilaginous green pods used as basis for soups and stews; sometimes placed in genus Hibiscus
obedience plant
— Noun
– English
～ white-flowered West Indian plant whose root yields arrowroot starch
obedient plant
— Noun
– English
～ North American plant having a spike of two-lipped pink or white flowers