Acaryote see akaryote

acaudal, acaudate, ecaudate a. [Gr. a, without; L. cauda, tail] Without a tail.

acceleration n. [L. acceleratare, to hasten to] The speeding up of a development so that a feature appears earlier in the ontogeny of a descendant than in an ancestor.

accentuation n. [L. ad, to; canere, to sing] Intensify; increase distinctness.

accessory a.; pl. -ries [L. ad, to; cedere, move] Contributing to the effectiveness of a principal design; secondary; supplemental.

accessory appendages (ARTHRO: Insecta) In Odonata, the genital appendages (intromittent organs) on the venter of the second and third abdominal segment.

accessory bodies Argyrophil particles obtained from Golgi bodies in spermatocytes. see chromatoid bodies.

accessory boring organ (MOLL: Gastropoda) A glandular structure (in naticaceans on the lower lip, and in muri-aceans sole of the foot) that aid the radular rasping process by acidic secretions so mechanical removal by the radula is made easy.

acessory cell (ARTHRO: Insecta) A cell in the wing not normally present in the group, or definite location.

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