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  • Acrosomal cap

    acrosomal cap acrosomal cap n. A caplike structure at the anterior end of a spermatozoon that produces enzymes aiding in egg penetration. Also called acrosome, head cap.

  • Acrosomal granule

    acrosomal granule acrosomal granule n. A large granule that is formed by the coalescing of proacrosomal granules within the acrosomal vesicle and adheres to the nuclear envelope of a developing spermatozoon.

  • Acrosomal vesicle

    acrosomal vesicle acrosomal vesicle n. A vesicle derived from the Golgi apparatus during spermiogenesis; its membrane adheres to the nuclear envelope of the sperm and, together the the acrosomal granule within the vesicle, spreads in a thin layer over the pole of the nucleus to form the acrosomal cap.

  • Acrospire

    the first sprout appearing in the germination of grain; the developed plumule of the seed. Historical Examples By about the eighth day of flooring the acrospire should be about three-quarters up the corn. Encyclopaedia Britannica, 11th Edition, Volume 17, Slice 4 Various The malting, however, is complete before the acrospire becomes a leaf. A Dictionary […]

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