opercule
(Britain) To potter, to be gently active doing various things in an almost aimless manner.
In a shotgun, a bore which is tapered to a slightly smaller diameter at a short distance to the rear of the muzzle, in order to prevent the rapid dispersion of the shot.
(biology) A spermoblast.
Alternative form of operculum
収集家は化石から蓋を慎重に取り外して、その下にある筋肉の付着部を調べた。
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