\Cre*pus"cu*lar\, adj 1: Pertaining to twilight; glimmering; hence, imperfectly clear or luminous 2: (Zoology) Flying in the twilight or evening, or before sunrise; feeding only in the twilight or evening
Of or like the twilight Or, indistinct; glimmering; imperfectly luminous; obscure
Flying in the twilight or evening, or before sunrise; said certain birds and insects
{s} pertaining to twilight, of the period immediately after sunset or before sunrise; (about animals) active during the twilight hours, active in the early evening or early morning