| adrift | (adjective) afloat on the surface of a body of water | - |
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| (adjective) aimlessly drifting | Synonyms: afloat, aimless, directionless, planless, rudderless, undirected |
| (adverb) off course, wandering aimlessly | - |
| (adverb) floating freely; not anchored | - |
| escadrille | (noun) an air force squadron typically containing six airplanes (as in France during World War I) | - |
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| (noun) a small squadron | - |
| espadrille | (noun) a sandal with a sole made of rope or rubber and a cloth upper part | - |
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| madrigal | (noun) an unaccompanied partsong for 2 or 3 voices; follows a strict poetic form | - |
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| (verb) sing madrigals | - |
| madrigalist | (noun) a singer of madrigals | - |
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| madrilene | (noun) a tomato-flavored consomme; often served chilled | - |
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| orphenadrine | (noun) a skeletal muscle relaxant (trade name Norflex) used to treat severe muscle strain and Parkinsonism | Synonyms: Norflex |
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| quadric | (noun) a curve or surface whose equation (in Cartesian coordinates) is of the second degree | Synonyms: quadric surface |
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| quadriceps | (noun) a muscle of the thigh that extends the leg | Synonyms: musculus quadriceps femoris, quad, quadriceps femoris |
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| quadrilateral | (adjective) having four sides | Synonyms: four-sided |
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| (noun) a four-sided polygon | Synonyms: quadrangle, tetragon |
| quadrille | (noun) a square dance of 5 or more figures for 4 or more couples | - |
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| (noun) music for dancing the quadrille | - |
| quadrillion | (noun) the number that is represented as a one followed by 15 zeros | - |
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| (noun) the number that is represented as a one followed by 24 zeros in the UK | - |
| quadrillionth | (adjective) the ordinal number of one quadrillion in counting order | - |
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| (noun) one part in a quadrillion equal parts | Synonyms: one-quadrillionth |
| quadripara | (noun) (obstetrics) woman who has given birth to a viable infant in each of four pregnancies | - |
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| quadripartite | (adjective) involving four parties | Synonyms: four-party |
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| quadriphonic | (adjective) of or relating to quadraphony | Synonyms: quadraphonic, quadrasonic, quadrisonic |
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| quadriplegia | (noun) paralysis of both arms and both legs | - |
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| quadriplegic | (noun) a person who is paralyzed in both arms and both legs | - |
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| quadrisonic | (adjective) of or relating to quadraphony | Synonyms: quadraphonic, quadrasonic, quadriphonic |
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| quadrivium | (noun) (Middle Ages) a higher division of the curriculum in a medieval university involving arithmetic and music and geometry and astronomy | - |
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