anepisternum n. [Gr. ana, up; epi, upon; sternon, breastbone] (ARTHRO: Insecta) The upper division of the epister-num. see infraepisternum.
aner n. [Gr. aner, male] (ARTHRO: Insecta) Male, especially in Formicidae.
anestrus, anoestrus n. [Gr. an, without; oistros, desire] A period of sexual inactivity; a non-breeding period.
aneucentric translocation One that involves the centromere of a chromosome; one daughter chromosome is acentric and the other dicentric.
aneuploid a. [Gr. an, without; eu, well; aploos, onefold] Refers to cells or individuals having one, two or a few whole chromosomes, more or less than the basic number of the species in question. see heteroploid, euploid.
aneuronic a. [Gr. an, without; neuron, nerve] Absence of innervation.
aneurose a. [Gr. an, without; neuron, nerve] 1. Without nerves. 2. (ARTHRO: Insecta) Term used for a wing with veins near the costa only.
anfractuose a. [L. anfractus, circuitous] Wavy, winding, turnings, sinuous.
angiogenesis n. [Gr. angeion, vessel; genesis, beginning] The development of blood vessels.
angiostomatous a. [Gr. angeion, vessel; stoma, mouth] Having a non-distensible mouth.
angstrom n. [after A. J. Angstrom] One hundred-millionth of a centimeter, or one-tenth of a nanometer (nm); a unit used in measuring the length of light waves.
angulate a. [L. angulare, to make angular] Having angles or sharp corners.
angulation n. [L. angulus, angular] An angular formation or edge where two surfaces meet at an angle.
anguli frontales (ARTHRO: Insecta) In immatures, the anterior projections from the frons situated laterad to a median projection, the nasale; may or may not be symmetrical.
angustate antenna (ARTHRO: Insecta) An antenna in which the intermediate and terminal joints are thinner.
angusticorn trumpet (ARTHRO: Insecta) In Diptera, a respiratory structure of Culicidae pupae bearing the longest axis vertically and approximately in line with the stem, funnel-shaped when closed, with a split (meatal cleft) down one side allowing it to open widely at the water surface.
angustirostrate a. [L. angustus, narrow; rostrum, beak] Having a narrow rostrum or snout. see latirostrate.
anholocyclic a. [Gr. an, without; holos, whole; kyklos, circle] Having only parthenogenetic reproduction. see holocyclic.
anhydrobiosis n. [Gr. an, without; hydor, water; biosis, manner of life] A state of dormancy in various invertebrates due to low humidity or desiccation.
anhydrous a. [Gr. an, without; hydor, water] Being without water; completely lacking in water.
animal n. [L. animalis, a living being] Any member of a group of living organisms distinguished from plants by a definite body form, absence of rigid cell walls of cellulose, locomotion responses to external stimuli, and inability to manufacture foods from inorganic substances.
Animalia n. [L. animalis, a living being] A kingdom of organisms that contains the animals.
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