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The Collaborative International Dictionary
Seasonal dimorphism

Seasonal \Sea"son*al\, a.

  1. Of or pertaining to the seasons.

  2. Occurring or being used in a specific season; as, seasonal items for sale.

    Seasonal dimorphism (Zo["o]l.), the condition of having two distinct varieties which appear at different seasons, as certain species of butterflies in which the spring brood differs from the summer or autumnal brood.