| arroba | (noun) a unit of weight used in some Spanish speaking countries | - |
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| (noun) a liquid measure (with different values) used in some Spanish speaking countries | - |
| arrogance | (noun) overbearing pride evidenced by a superior manner toward inferiors | Synonyms: haughtiness, hauteur, high-handedness, lordliness |
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| arrogation | (noun) seizure by the government | Synonyms: confiscation |
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| arrogator | (noun) a person who through conceit makes pretentious claims to rights or advantages that he or she is not entitled to or to qualities that he or she does not possess | - |
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| arrow | (noun) a projectile with a straight thin shaft and an arrowhead on one end and stabilizing vanes on the other; intended to be shot from a bow | - |
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| (noun) a mark to indicate a direction or relation | Synonyms: pointer |
| arrowhead | (noun) the pointed head or striking tip of an arrow | - |
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| arrowroot | (noun) white-flowered West Indian plant whose root yields arrowroot starch | Synonyms: American arrowroot, Maranta arundinaceae, obedience plant |
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| (noun) canna grown especially for its edible rootstock from which arrowroot starch is obtained | Synonyms: achira, Canna edulis, Canna indica, indian shot |
| (noun) a nutritive starch obtained from the root of the arrowroot plant | - |
| arrowsmith | (noun) a maker of arrows | - |
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| arrowworm | (noun) any worm of the Chaetognatha; transparent marine worm with horizontal lateral and caudal fins and a row of movable curved spines at each side of the mouth | Synonyms: chaetognath |
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| arroyo | (noun) a stream or brook | - |
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