crepuscular

crepuscular is defined in Webster's Unabridged Dictionary (1913) with 1 sense. The full text of each entry is reproduced verbatim below.

Definitions

  1. 1.(Zoöl.) Flying in the twilight or evening, or before sunrise; -- said certain birds and insects. Others feed only in the twilight, as bats and owls, and are called crepuscular. Whewell.

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

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