retrogression

retrogression is defined in Webster's Unabridged Dictionary (1913) with 1 sense, and appears in Roget's Thesaurus (1911) with 21 related terms. The full text of each entry is reproduced verbatim below.

Definitions

  1. 1.(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.

Source: Webster's Unabridged Dictionary, 1913 edition (public domain, via GCIDE / Project Gutenberg).

Synonyms

Related terms (Roget's 1911)

Source: Roget's Thesaurus, 1911 edition (public domain, via Project Gutenberg eBook #10681).

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