retrograde development
Retrogression Re`tro*gres"sion, n. [Cf. F. r['e]trogression. See {Retrograde}, and cf. {Digression}.] 1. The act of retrograding, or going backward; retrogradation. [1913 Webster]

2. (Biol.) Backward development; a passing from a higher to a lower state of organization or structure, as when an animal, approaching maturity, becomes less highly organized than would be expected from its earlier stages or known relationship. Called also {retrograde development}, and {regressive metamorphism}. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • retrograde — 1. Moving backward. 2. Degenerating; reversing the normal order of growth and development. [L. retrogradus, fr. retro + gradior, to go] * * * ret·ro·grade re trə .grād adj 1) characterized by retrogression 2) affecting a period immediately prior… …   Medical dictionary

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  • malformation — /mal fawr may sheuhn, feuhr /, n. faulty or anomalous formation or structure, esp. in a living body: malformation of the teeth. [1790 1800; MAL + FORMATION] * * * ▪ biology Introduction       in biology, irregular or abnormal structural… …   Universalium

  • regressive metamorphism — Retrogression Re tro*gres sion, n. [Cf. F. r[ e]trogression. See {Retrograde}, and cf. {Digression}.] 1. The act of retrograding, or going backward; retrogradation. [1913 Webster] 2. (Biol.) Backward development; a passing from a higher to a… …   The Collaborative International Dictionary of English

  • Retrogression — Re tro*gres sion, n. [Cf. F. r[ e]trogression. See {Retrograde}, and cf. {Digression}.] 1. The act of retrograding, or going backward; retrogradation. [1913 Webster] 2. (Biol.) Backward development; a passing from a higher to a lower state of… …   The Collaborative International Dictionary of English

  • devolution — n. [L. de, away from; evolvere, to unroll] Retrograde development; degeneration …   Dictionary of invertebrate zoology

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