| acuate | (adjective) ending in a sharp point | Synonyms: acute, needlelike, sharp |
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| acuity | (noun) a quick and penetrating intelligence | Synonyms: acuteness, keenness, sharpness |
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| (noun) sharpness of vision; the visual ability to resolve fine detail (usually measured by a Snellen chart) | Synonyms: sharp-sightedness, visual acuity |
| aculea | (noun) small spiny outgrowth on the wings of certain insects | - |
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| aculeate | (adjective) having or resembling a stinger or barb | Synonyms: aculeated |
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| aculeated | (adjective) having or resembling a stinger or barb | Synonyms: aculeate |
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| aculeus | (noun) a sharp-pointed process especially a sting of a hymenopterous insect | - |
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| (noun) a stiff sharp-pointed plant process | - |
| acumen | (noun) shrewdness shown by keen insight | Synonyms: insightfulness |
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| (noun) a tapering point | - |
| acuminate | (adjective) (of a leaf shape) narrowing to a slender point | - |
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| (verb) make sharp or acute; taper; make (something) come to a point | - |
| acupressure | (noun) treatment of symptoms by applying pressure with the fingers to specific pressure points on the body | Synonyms: G-Jo, shiatsu |
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| acupuncture | (noun) treatment of pain or disease by inserting the tips of needles at specific points on the skin | Synonyms: stylostixis |
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| acute | (adjective) having or experiencing a rapid onset and short but severe course | - |
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| (adjective) of an angle; less than 90 degrees | - |
| (adjective) of critical importance and consequence | - |
| (adjective) having or demonstrating ability to recognize or draw fine distinctions | Synonyms: discriminating, incisive, keen, knifelike, penetrating, penetrative, piercing, sharp |
| (adjective) ending in a sharp point | Synonyms: acuate, needlelike, sharp |
| (adjective) extremely sharp or severe | Synonyms: intense |
| (noun) a mark placed above a vowel to indicate pronunciation | Synonyms: acute accent, ague |
| acutely | (adverb) having a rapid onset | - |
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| (adverb) in a keen or penetrating way | Synonyms: keenly |
| (adverb) changing suddenly in direction and degree | Synonyms: sharp, sharply |
| (adverb) in a shrewd manner | Synonyms: astutely, sagaciously, sapiently, shrewdly |
| acuteness | (noun) the quality of having a sharp edge or point | - |
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| (noun) a quick and penetrating intelligence | Synonyms: acuity, keenness, sharpness |
| (noun) a sensitivity that is keen and highly developed | - |