| duad | (noun) two items of the same kind | Synonyms: brace, couple, couplet, distich, duet, duo, dyad, pair, span, twain, twosome, yoke |
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| quad | (noun) a rectangular area surrounded on all sides by buildings | Synonyms: quadrangle |
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| (noun) (printing) a block of type without a raised letter; used for spacing between words or sentences | Synonyms: space |
| (noun) a muscle of the thigh that extends the leg | Synonyms: musculus quadriceps femoris, quadriceps, quadriceps femoris |
| (noun) one of four children born at the same time from the same pregnancy | Synonyms: quadruplet |
| squad | (noun) a cooperative unit (especially in sports) | Synonyms: team |
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| (noun) a smallest army unit | - |
| (noun) a small squad of policemen trained to deal with a particular kind of crime | Synonyms: police squad |