any of various microfossils, of unknown biological affinities, having a central cavity enclosed by a wall of chiefly organic composition.


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  • Acritical

    not . Medicine/Medical. (of a disease) not showing a crisis. acritical a·crit·i·cal (ā-krĭt’ĭ-kəl, ə-krĭt’-) adj. Not critical; not marked by crisis. Indeterminate, especially concerning prognosis.

  • Acrm

    acrm American Congress of Rehabilitation Medicine

  • Acro

    a combining form with the meanings “height,” “tip end,” “extremities of the body,” used in the formation of compound words: acrophobia. Historical Examples acro’s has been overlaid by other commentators until the identity of his work is lost. Horace and His Influence Grant Showerman combining form denoting something at a height, summit, top, tip, beginning, […]

  • Acroagnosis

    acroagnosis acroagnosis ac·ro·ag·no·sis (āk’rō-āg-nō’sĭs) n. Absence of sensory perception of the limbs.

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