sperm nucleus
noun Date: 1887 either of two nuclei that derive from the generative nucleus of a pollen grain and function in the fertilization of a seed plant

New Collegiate Dictionary. 2001.

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  • sperm nucleus — noun : the nucleus of a male gamete; especially : either of the two nuclei that arise from the generative nucleus of a pollen grain and function in the double fertilization characteristic of seed plants …   Useful english dictionary

  • sperm nucleus — the structure within the head of the spermatozoon that becomes the male pronucleus after the spermatozoon fertilizes the oocyte …   Medical dictionary

  • Sperm heteromorphism — is the simultaneous production of two or more distinguishable types of sperm by a single male. The sperm types might differ in size, shape and/or chromosome complement. Sperm heteromorphism is also called sperm polymorphism or sperm dimorphism… …   Wikipedia

  • Sperm — The term sperm is derived from the Greek word (σπέρμα) sperma (meaning seed ) and refers to the male reproductive cells. In the types of sexual reproduction known as anisogamy and oogamy, there is a marked difference in the size of the gametes… …   Wikipedia

  • sperm — sperm1 /sperrm/, n., pl. sperm, sperms for 2. 1. semen. 2. a male reproductive cell; spermatozoon. [1350 1400; ME sperme < LL sperma < Gk spérma seed, equiv. to sper (base of speírein to sow seeds) + ma n. suffix of result] sperm2 /sperrm/, n …   Universalium

  • sperm cell — noun the male reproductive cell; the male gamete a sperm is mostly a nucleus surrounded by little other cellular material • Syn: ↑sperm, ↑spermatozoon, ↑spermatozoan • Derivationally related forms: ↑spermatic (for: ↑ …   Useful english dictionary

  • Nucleus — 1) In cell biology, the structure that houses the chromosomes. 2) In neuroanatomy, a group of nerve cells. * * * 1. In cytology, typically a rounded or oval mass of protoplasm within the cytoplasm of a plant or animal cell; it is surrounded by a… …   Medical dictionary

  • Cell nucleus — HeLa cells stained for the cell nucleus DNA with the Blue Hoechst dye. The central and rightmost cell are in interphase, thus their entire nuclei are labeled. On the left, a cell is going through mitosis and its DNA has condensed ready for… …   Wikipedia

  • endosperm nucleus — noun Date: circa 1902 the triploid nucleus formed in the embryo sac of a seed plant by fusion of a sperm nucleus with two polar nuclei or with a nucleus formed by the prior fusion of the polar nuclei …   New Collegiate Dictionary

  • endosperm nucleus — noun : the triploid nucleus formed in the embryo sac of a seed plant by fusion of a sperm nucleus with the two polar nuclei or with a nucleus produced by their prior fusion compare double fertilization …   Useful english dictionary

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