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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Re·gress·ive a.
 1. Passing back; returning.
 2. Characterized by retrogression; retrogressive.
 Regressive metamorphism. (a) Biol. See Retrogression. (b) Physiol. See Katabolism.
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From: Webster's Revised Unabridged Dictionary (1913)

 Re·tro·gres·sion n.
 1. The act of retrograding, or going backward; retrogradation.
 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.
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