decorticate v.t. [L. de, away from; cortex, bark] To divest of the exterior coating; deprived of the cortex or outer coat.
decticous a. [Gr. dektikos, biting] (ARTHRO: Insecta) Having functional mandibles in the puparium, cell, or cocoon. see adecticous.
decumbent a. [L. decumbere, to lie down] Bending downward; upright at the base and bending down at the tip.
decurved a. [L. de, away from; curvus, bend] Bowed or curved downward.
decussated a. [L. decussatus, formed crosswise like the letter X] 1. Intersected; striations or bristles crossing at acute angles forming a series of X's. 2. (ARTHRO: Insecta) Pertaining to bristles of some Diptera. 3. (MOLL: Gastropoda)
Pertaining to radial ribs.
dedetermination n. [L. de, away from; determinare, to limit] Reversion of cells to their embryonic state.
dedifferentiation n. [L. de, away from; differentia, difference] Loss of traits of specialized cells formed during the course of differentiation.
defaunate n. [L. de, away from; Fauna, deity of herds and fields] To remove from an organism its commensalistic or mutualistic microfauna, for which the organism ordinarily serves as a host.
defecate v.i. [L. defaecare, to void excrement] To void feces.
deferent a. [L. de, away from; ferre, to carry] Carrying away; deferent duct.
deficiency n., pl. -cies [L. deficiens, wanting] Structural change resulting in the loss of a terminal part of a chromosome.
definition n. [L. definitus, limited] 1. Limitation; defining limits. 2. In taxonomic work, the formal statement of characters delimiting the taxonomic category.
definitive host One in which the terminal (frequently sexual) stage of the parasite occurs; primary host. see intermediate host.
definitive reservoir A host or location in which a natural supply of the terminal stage (frequently sexual) of a parasite occurs.
deflected a. [L. de, away from; flectere, to bend] 1. Bent backward or to one side or downward. 2. (ARTHRO: Insecta) Wings having the inner margins lapping and the outer margins declining toward the sides.
deflected front (ARTHRO: Crustacea) In some Decapoda, the broadly downturned front margin of the carapace.
deflexed a. [L. de, away from; flectere, to bend] Bent abruptly downward.
defoliator n. [L. de, away from; folium, leaf] Any agent, animal or chemical that destroys the leaves of plants.
deformed a. [L. deformis, misshapen] 1. Disarranging or set ting in an unusual form. 2. (ARTHRO: Insecta) The knotted or twisted antennae in male Meloidae.
degenerate v.i. [L. degenerare, to depart from its kind] To retrogress to a lower type; to deteriorate.
degenerate code The genetic code in which more than one nucleotide triplet codes for the same amino acid.
degeneration n. [L. degenerare, to depart from its kind] A progressive deterioration to a less specialized or functionally less active form; retrogressive development.
dehiscence n. [L. dehiscere, to split open] The cracking, splitting or tearing of an opening in an organ or structure along lines of weakness. dehiscent a.
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