Definitions

from The Century Dictionary.

  • noun The act of going backward; retrogradation.
  • noun In astronomy, same as retrogradation.
  • noun In biology, backward development; degeneration; retrograde metamorphosis.

from the GNU version of the Collaborative International Dictionary of English.

  • noun The act of retrograding, or going backward; retrogradation.
  • noun (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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A deterioration or decline to a previous state
  • noun biology A return to a less complex condition

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun returning to a former state
  • noun passing from a more complex to a simpler biological form

Etymologies

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Examples

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