a needle for cutting tissue by means of a high-frequency electric current.

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  • Acutance

    a measure of the sharpness with which a film can reproduce the edge of an object. noun a physical rather than subjective measure of the sharpness of a photographic image

  • Acute

    sharp or severe in effect; intense: acute sorrow; an acute pain. extremely great or serious; crucial; critical: an acute shortage of oil. (of disease) brief and severe (opposed to ). sharp or penetrating in intellect, insight, or perception: an acute observer. extremely sensitive even to slight details or impressions: acute eyesight. sharp at the end; […]

  • Acute abdomen

    acute abdomen acute abdomen n. a serious condition within the abdomen characterized by sudden onset, pain, tenderness, and muscular rigidity, and usually requiring emergency surgery. also called surgical abdomen.

  • Acute adrenocortical insufficiency

    acute adrenocortical insufficiency acute adrenocortical insufficiency n. a severe phase or attack of a chronic adrenocortical disorder such as addison’s disease, characterized by insufficient amounts of the adrenocortical hormones and resulting in nausea, vomiting, low blood pressure, and life-threatening imbalances in electrolytes. also called addisonian crisis, adrenal crisis.

  • Acute accent

    noun the diacritical mark (´), used in the writing system of some languages to indicate that the vowel over which it is placed has a special quality (as in french été) or that it receives the strongest stress in the word (as in spanish hablé) historical examples on many of the transcriptions used in this […]

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