| adrenal | (adjective) of or pertaining to the adrenal glands or their secretions | - |
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| (adjective) near the kidneys | - |
| adrenergic | (adjective) relating to epinephrine (its release or action) | Synonyms: sympathomimetic |
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| adrenocortical | (adjective) of or derived from the cortex of the adrenal glands | - |
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| adrenocorticotrophic | (adjective) stimulating or acting on the adrenal cortex | Synonyms: adrenocorticotropic |
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| adrenocorticotropic | (adjective) stimulating or acting on the adrenal cortex | Synonyms: adrenocorticotrophic |
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| 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 |
| adroit | (adjective) quick or skillful or adept in action or thought | - |
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| anadromous | (adjective) migrating from the sea to fresh water to spawn | - |
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| antiadrenergic | (adjective) relating to blocking or reducing adrenergic effects in the body | - |
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| biquadratic | (adjective) involving the fourth and no higher power of a quantity or degree | - |
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| catadromous | (adjective) migrating from fresh water to the sea to spawn | - |
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| diadromous | (adjective) (used of fish) migratory between fresh and salt waters | - |
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| maladroit | (adjective) not adroit | - |
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| quadrangular | (adjective) of or relating to or shaped like a quadrangle | - |
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| quadraphonic | (adjective) of or relating to quadraphony | Synonyms: quadrasonic, quadriphonic, quadrisonic |
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| quadrasonic | (adjective) of or relating to quadraphony | Synonyms: quadraphonic, quadriphonic, quadrisonic |
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| quadrate | (adjective) having four sides and four angles | - |
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| quadratic | (adjective) involving the second and no higher power of a quantity or degree | - |
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| quadrilateral | (adjective) having four sides | Synonyms: four-sided |
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| quadrillionth | (adjective) the ordinal number of one quadrillion in counting order | - |
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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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| quadrisonic | (adjective) of or relating to quadraphony | Synonyms: quadraphonic, quadrasonic, quadriphonic |
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| quadruped | (adjective) having four feet | Synonyms: four-footed, quadrupedal |
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| quadrupedal | (adjective) having four feet | Synonyms: four-footed, quadruped |
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| quadruple | (adjective) four times as great or many | Synonyms: four-fold, fourfold |
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| (adjective) having four units or components | Synonyms: four-fold, fourfold, quadruplex, quadruplicate |
| quadruplex | (adjective) having four units or components | Synonyms: four-fold, fourfold, quadruple, quadruplicate |
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| quadruplicate | (adjective) having four units or components | Synonyms: four-fold, fourfold, quadruple, quadruplex |
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