one designated oesp. as the 15th in order or class
something shaped like the letter O
zero
ocean
ohm
old
order
over
O [(')ō] -interj
(variant of oh)
used to express an emotion (as surprise or desire) or in response to physical stimuli
used in direct address
oh, waiter Will you come here, please?
used to express acknowledgment or understanding of a statement
used to introduce an example or approximation
zero
oaf ['ōf] -n, adj, adv
a stupid person : boob
a big clumsy slow-witted person
oak ['ōk] -n, adj
any of a genus ( Quercus) of trees or shrubs of the beech family that produce acorns
any of various plants related to or resembling the oaks
the tough hard durable wood of an oak tree
the leaves of an oak used as decoration
oak apple -n
a large round gall produced on oak leaves and twigs by a gall wasp (esp. Amphibolips confluenta)
oakleaf cluster -n
a bronze or silver cluster of oak leaves and acorns added to various military decorations to signify a second or subsequent award of the basic decoration
oak·moss ['ōk-,mȯs] -n
any of several lichens (as Evernia prunastri) that grow on oak trees and yield a resin used in perfumery
oa·kum ['ō-kəm] -n
loosely twisted hemp or jute fiber impregnated with tar or a tar derivative and used in caulking seams and packing joints
oak wilt -n
a destructive disease of oak trees that is caused by a fungus ( Ceratocystis fagacearum) and is characterized by wilting, discoloration, and defoliation
oar ['ȯr] -n, adj
a long pole with a broad blade at one end used for propelling or steering a boat
oarsman
to propel with or as if with oars : row
to progress by or as if by using oars
oar·fish ['ȯr-,fish] -n
a marine bony fish ( Regalecus glesne) of subtropical waters with a narrow soft body from 20 to 30 feet (6 to 9 meters) long, a red dorsal fin running the entire length of the body, and red-tipped anterior rays rising above the head
oar·lock [-,läk] -n
a usu. U-shaped device for holding an oar in place
oars·man ['ȯrz-mən] -n
one who rows esp. in a racing crew
oars·wom·an [-,wu̇-mən] -n
a woman who is an oarsman
OAS -abbr
Organization of American States
OASDI -abbr
Old-Age, Survivors, and Disability Insurance
oa·sis [ō-'ā-səs] -n
a fertile or green area in an arid region (as a desert)
something that provides refuge, relief, or pleasant contrast
oast ['ōst] -n
a usu. conical kiln used for drying hops, malt, or tobacco called also oast*house -has
oat ['ōt] -n
any of several grasses (genus Avena)
a widely cultivated cereal grass ( A. sativa)
a crop or plot of the oat
the seed of an oat usu. used in pl. but sing. or pl. in constr.
a reed instrument made of an oat straw
oat·cake ['ōt-,kāk] -n
a thin flat oatmeal cake
oat cell -n
any of the small round or oval cells with a high ratio of nuclear protoplasm to cytoplasm that resemble oat grains and are characteristic of a small-cell lung cancer
oat·en ['ō-tᵊn] -adj
of or relating to oats, oat straw, or oatmeal
oat·er ['ō-tər] -n
western
oat grass -n
wild oat
any of several grasses resembling the oat
oath ['ōth] -n
a solemn usu. formal calling upon God or a god to witness to the truth of what one says or to witness that one sincerely intends to do what one says
a solemn attestation of the truth or inviolability of one's words