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From German Energid, from Ancient Greek ἐνεργός (energós, active) + German -id (= English -id).


energid (plural energids)

  1. (biology) A nucleus and the cytoplasm with which it interacts, considered as a unit.
    • 1982, Robert R. Provine, 15: Embryonic and post-embryonic development, William J. Bell, K.G. Adiyodi (editors), The American Cockroach, page 402,
      The fate of the cleavage energids seems to be determined by the regional nature of the periplasm, because elimination of some of the migrating energids by ultraviolet irradiation produces no structural deficits in the embryo; other energids replace them (Seidel, 1932).
    • 2006, Lisa Nagy, Miodrag Grbić, Embryogenesis, Timothy D. Schowalter (editor), Insect Ecology: An Ecosystem Approach, 2nd Edition, page 317,
      Nuclei and associated cytoplasm are referred to as energids. Upon reaching a critical density, the energids migrate to the periphery of the egg. The arrival of the energids at the surface is sometimes visually apparent as bumps along the surface. At the periphery, the energids continue to undergo several rounds of division.
    • 2012, Klaus Kalthoff, Analysis of a Morphogenetic Determinant in an Insect Embryo (Smittia Spec., Chironomidae, Diptera), Stephen Subtelny, Irwin R. Konigsberg (editors), Determinants of Spatial Organization, page 98,
      Rather, the embryo develops in a plasmodial state, containing eventually hundreds of energids, i.e. nuclei with jackets of cytoplasm. Some energids remain as vitellophages in the endoplasm, while most energids enter the yolk-free periplasm at the surface.