| 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 |