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Webster 1913 Edition

Noun.

[L.

musculus

: cf. F.

muscule

(Mil.)

A long movable shed used by besiegers in ancient times in attacking the walls of a fortified town.

muscule ‎(plural muscules)

(military) A long movable shed used by besiegers in ancient times in attacking the walls of a fortified town.

mūscule

Borrowing from Latin muscule, as if from Latin *mūscula, though the actual nominative plural of mūsculus is mūsculī, not *mūscula.

muscule f ‎(oblique plural muscules, nominative singular muscule, nominative plural muscules)