megetic a. [Gr. megas, large] Pertaining to size variations in polymorphic forms. see epimegetic, eumegetic, hy-pomegetic.
Mehlis' glands (PLATY: Trematoda) Unicellular mucous and serous glands surrounding the ootype in the reproductive system.
meiocyte n. [Gr. meion, smaller; kytos, container] Primary oocytes and spermatocytes.
meiofauna n. [Gr. meion, smaller; L. Faunus, diety of herds and fields] Microscopic and small macroscopic fauna on the sea bottom.
meiolecithal a. [Gr. meion, smaller; lekithos, egg yolk] Having little yolk.
meiomery n. [Gr. meion, smaller; meros, part] The condition of possessing fewer than the normal number of parts.
meiosis n.; pl. meioses [Gr. meiosis, to make smaller] Two successive cell divisions in the developing germ cells characterized by the pairing and segregation of homologous chromosomes, resulting in reduction from a diploid number to a haploid one. meiotic a.
meiotic drive A meiotic mechanism of cell division resulting in two kinds of gametes produced by a heterozygote with unequal recovery.
meiotrichy n. [Gr. meion, smaller; thrix, hair] Loss of setae in ontogenetic development or of homologous setae in natural groups.
melania n. [Gr. melas, black] Blackness.
melanin n. [Gr. melas, black] A term for a group of chemically ill-defined pigments, often found associated with protein, produced by insects and marine animals responsible for colors from brown to black. melanoid a.
melanism n. [Gr. melas, black; ismos, denoting condition] 1. An excessive darkening of color owing to increased amounts of black pigment. 2. A certain percentage of individuals in a population that give rise to polymorphism. see industrial melanism, albinism.
melanoid a. [Gr. melas, black; eidos, like] Looking black or dark.
meliphagous a. [Gr. meli, honey; phagein, to eat] Honey-eating; melivourous.
melittology n. [Gr. melitta, honeybee; logus, discourse] The study of bees.
melittophily n. [Gr. melitta, honeybee; philos, love] (ARTHRO: Insecta) 1. A symbiont of social bees. 2. Any organism that must spend a portion of its life cycle in a bee colony.
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