Dictionary

All Word
old hand Noun an experienced person who has been through many battles
old stager Noun an experienced person who has been through many battles
offshoot Noun a natural consequence of development
organic phenomenon Noun (biology) a natural phenomenon involving living plants and animals
optical aberration Noun an optical phenomenon resulting from the failure of a lens or mirror to produce a good image
occluded front Noun (meteorology) a composite front when colder air surrounds a mass of warm air and forces it aloft
overpressure Noun a transient air pressure greater than the surrounding atmospheric pressure
oil pressure Noun pressure that keeps oil on the moving parts of an internal-combustion engine
osmotic pressure Noun (physical chemistry) the pressure exerted by a solution necessary to prevent osmosis into that solution when it is separated from the pure solvent by a semipermeable membrane
ocean current Noun the steady flow of surface ocean water in a prevailing direction
optical opacity Noun opacity to light
ohmic resistance Noun a material's opposition to the flow of electric current
optical illusion Noun an optical phenomenon that results in a false or deceptive visual impression
ohmage Noun the ohmic resistance of a conductor
optical phenomenon Noun a physical phenomenon related to or involving light
overstrain Noun too much strain
overstrain Verb strain excessively
oospore Noun a thick-walled sexual spore that develops from a fertilized oosphere in some algae and fungi
oosphere Noun a gamete
oriental spruce Noun evergreen tree of the Caucasus and Asia Minor used as an ornamental having pendulous branchlets
oilseed Noun any of several seeds that yield oil
oil-rich seed Noun any of several seeds that yield oil
orthotropous ovule Noun a completely straight ovule with the micropyle at the apex
old man's beard Noun common climber of eastern North America that sprawls over other plants and bears numerous panicles of small creamy white flowers
old man's beard Noun vigorous deciduous climber of Europe to Afghanistan and Lebanon having panicles of fragrant green-white flowers in summer and autumn
old man's beard Noun dense festoons of greenish-grey hairlike flexuous strands anchored to tree trunks and branches by sparse wiry roots
ordeal tree Noun evergreen shrub or tree of South Africa
oleander Noun an ornamental but poisonous flowering shrub having narrow evergreen leaves and clusters of fragrant white to pink or red flowers: native to East Indies but widely cultivated in warm regions
order-Chenopodiales Noun corresponds approximately to the older group Centrospermae
oak-leaved goosefoot Noun annual European plant with spikes of greenish flowers and leaves that are white and hairy on the underside
oakleaf goosefoot Noun annual European plant with spikes of greenish flowers and leaves that are white and hairy on the underside
orchid cactus Noun any cactus of the genus Epiphyllum having flattened jointed irregularly branching stems and showy tubular flowers
ombu Noun fast-growing herbaceous evergreen tree of South America having a broad trunk with high water content and dark green oval leaves
orach Noun any of various herbaceous plants of the genus Atriplex that thrive in deserts and salt marshes
orache Noun any of various herbaceous plants of the genus Atriplex that thrive in deserts and salt marshes
oriental poppy Noun commonly cultivated Asiatic perennial poppy having stiff heavily haired leaves and bright scarlet or pink to orange flowers
opium poppy Noun southwestern Asian herb with greyish leaves and white or reddish flowers
orange daisy Noun mat-forming herb of Turkestan with nearly double orange-yellow flowers
orange fleabane Noun mat-forming herb of Turkestan with nearly double orange-yellow flowers
oxeye daisy Noun tall leafy-stemmed Eurasian perennial with white flowers
oxeye daisy Noun similar to oxeye daisy
ox-eyed daisy Noun tall leafy-stemmed Eurasian perennial with white flowers
othonna Noun a South African plant of the genus Othonna having smooth often fleshy leaves and heads of yellow flowers
orange sneezeweed Noun stout perennial herb of western United States having flower heads with drooping orange-yellow rays
owlclaws Noun stout perennial herb of western United States having flower heads with drooping orange-yellow rays
old man of the mountain Noun whitish hairy plant with featherlike leaves and a few stout stems each bearing an especially handsome solitary large yellow flower head
oxtongue Noun widespread European weed with spiny tongue-shaped leaves and yellow flowers
orange hawkweed Noun European hawkweed having flower heads with bright orange-red rays
orchid family Noun enormous cosmopolitan family of perennial terrestrial or epiphytic plants with fleshy tubers or rootstocks and unusual flowers
orchid Noun any of numerous plants of the orchid family usually having flowers of unusual shapes and beautiful colors