adductor muscle (of a bivalve)
Technical term in biology and anatomy, specifically referring to the muscle that closes the shell of bivalve mollusks such as clams and oysters.
二枚貝の閉殻筋は、貝殻を閉じるために使われる。
The adductor muscle of a bivalve is used to close the shell.
Compound of 閉 (へい, 'close'), 殻 (かく, 'shell'), and 筋 (きん, 'muscle'). The term is a direct calque of the English 'adductor muscle' in the context of bivalve anatomy.