| oaf | (noun) an awkward stupid person | Synonyms: clod, gawk, goon, lout, lubber, lummox, lump, stumblebum |
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| oafish | (adjective) ill-mannered and coarse and contemptible in behavior or appearance | Synonyms: boorish, loutish, neandertal, neanderthal, swinish |
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| oak | (noun) a deciduous tree of the genus Quercus; has acorns and lobed leaves | Synonyms: oak tree |
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| (noun) the hard durable wood of any oak; used especially for furniture and flooring | - |
| oaken | (adjective) consisting of or made of wood of the oak tree | - |
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| oakum | (noun) loose hemp or jute fiber obtained by unravelling old ropes; when impregnated with tar it was used to caulk seams and pack joints in wooden ships | - |
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| oar | (noun) an implement used to propel or steer a boat | - |
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| oarfish | (noun) thin deep-water tropical fish 20 to 30 feet long having a red dorsal fin | Synonyms: king of the herring, Regalecus glesne, ribbonfish |
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| oarlock | (noun) a holder attached to the gunwale of a boat that holds the oar in place and acts as a fulcrum for rowing | Synonyms: peg, pin, rowlock, thole, tholepin |
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| oarsman | (noun) a male who rows a boat | - |
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| oarsmanship | (noun) skill as an oarsman | - |
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| oarswoman | (noun) a woman oarsman | - |
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| oasis | (noun) a shelter serving as a place of safety or sanctuary | Synonyms: haven |
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| (noun) a fertile tract in a desert (where the water table approaches the surface) | - |
| oast | (noun) a kiln for drying hops | - |
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| oat | (noun) seed of the annual grass Avena sativa (spoken of primarily in the plural as `oats') | - |
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| (noun) annual grass of Europe and North Africa; grains used as food and fodder (referred to primarily in the plural: `oats') | - |
| oatcake | (noun) thin flat unleavened cake of baked oatmeal | - |
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| oaten | (adjective) of or related to or derived from oats | - |
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| oath | (noun) a commitment to tell the truth (especially in a court of law); to lie under oath is to become subject to prosecution for perjury | Synonyms: swearing |
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| (noun) profane or obscene expression usually of surprise or anger | Synonyms: curse, curse word, cuss, expletive, swearing, swearword |
| (noun) a solemn promise, usually invoking a divine witness, regarding your future acts or behavior | - |
| oatmeal | (noun) porridge made of rolled oats | Synonyms: burgoo |
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| (noun) meal made from rolled or ground oats | Synonyms: rolled oats |