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. 2001.

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  • 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

  • primary endosperm nucleus — noun : the nucleus formed by the fusion of two polar nuclei in the embryo sac of a seed plant prior to fertilization called also secondary nucleus; compare endosperm nucleus …   Useful english dictionary

  • endosperm — noun Etymology: French endosperme, from end + Greek sperma seed more at sperm Date: 1819 a nutritive tissue in seed plants formed within the embryo sac by division of the endosperm nucleus …   New Collegiate Dictionary

  • Endosperm — is the tissue produced in the seeds of most flowering plants around the time of fertilization. It surrounds the embryo and provides nutrition in the form of starch, though it can also contain oils and protein. This makes endosperm an important… …   Wikipedia

  • endosperm — /en deuh sperrm /, n. Bot. nutritive matter in seed plant ovules, derived from the embryo sac. [1840 50; < F endosperme; see ENDO , SPERM] * * * ▪ plant tissue       tissue that surrounds and nourishes the embryo in the angiosperm seed. The… …   Universalium

  • endosperm — Tripliod tissue of seeds composed mostly of starch containing cells, that arises from the fusion of a sperm nucleus with two polar nuclei of the embryo sac. In some seeds, the endosperm persists as a storage tissue and is used to nourish the… …   Combined glossary of agriculture

  • polar nucleus — noun : either of two nuclei that fuse in the center of the embryo sac of a seed plant to form the primary endosperm nucleus * * * Bot. either of two female haploid nuclei, in the embryo sac of flowers, that fuse to produce a diploid nucleus,… …   Useful english dictionary

  • fusion nucleus — noun 1. a. : primary endosperm nucleus b. : the triploid nucleus resulting from double fertilization that produces the endosperm nuclei in seed plants 2. a. : synkaryon …   Useful english dictionary

  • secondary nucleus — noun : primary endosperm nucleus …   Useful english dictionary

  • polar nucleus — Bot. either of two female haploid nuclei, in the embryo sac of flowers, that fuse to produce a diploid nucleus, which combines with a male nucleus to form the endosperm. [1880 85] * * * …   Universalium

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