o·per·cu·lum ( -pûr ky -lm)n. pl. o·per·cu·la (-l ) or o·per·cu·lums A lid or flap covering an aperture, such as the gill cover in some fishes or the horny shell cover in snails or other mollusks. [Latin, lid, from oper  re, to cover; see wer-4 in Indo-European roots.]o·per cu·lar (-lr) adj.o·per cu·lar·ly adv. |
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