once in a while
— Adverb
– English
～ sporadically and infrequently; "he was arrogant and occasionally callous"; "open areas are only occasionally interrupted by clumps of trees"; "they visit New York on occasion"; "now and again she would take her favorite book from the shelf and read to us"; "as we drove along, the beautiful scenery now and then attracted his attention"
Oregon white oak
— Noun
– English
～ small deciduous tree of western North America with crooked branches and pale grey bark
off-white
— Noun
– English
～ a shade of white the color of bleached bones
off-white
— Adjective
– English
～ of something having a color tending toward white
oceanic whitetip shark
— Noun
– English
～ large deep-water shark with white-tipped dorsal fin; worldwide distribution; most dangerous shark
on the whole
— Adverb
– English
～ with everything considered (and neglecting details); "altogether, I'm sorry it happened"; "all in all, it's not so bad"
Oscar Wilde
— Noun
– English
～ Irish writer and wit (1854-1900)
oriel window
— Noun
– English
～ a projecting bay window corbeled or cantilevered out from a wall
oval window
— Noun
– English
～ fenestra that has the base of the stapes attached to it
on the wing
— Adverb
– English
～ flying through the air; "we saw the ducks in flight"
one-winged
— Adjective
– English
～ having a single wing
one-flowered wintergreen
— Noun
– English
～ delicate evergreen dwarf herb of north temperate regions having a solitary white terminal flower; sometimes placed in genus Pyrola
oil of wintergreen
— Noun
– English
～ oil or flavoring obtained from the creeping wintergreen or teaberry plant
Owen Wister
— Noun
– English
～ United States writer (1860-1938)
old witch grass
— Noun
– English
～ North American grass with slender brushy panicles; often a weed on cultivated land
old witchgrass
— Noun
– English
～ North American grass with slender brushy panicles; often a weed on cultivated land
old wives' tale
— Noun
– English
～ a bit of lore passed on by word of mouth