The Collaborative International Dictionary
Muscule
Muscule \Mus"cule\, n. [L. musculus: cf. F. muscule.] (Mil.) A long movable shed used by besiegers in ancient times in attacking the walls of a fortified town.
Wiktionary
muscule
n. (context military English) A long movable shed used by besiegers in ancient times in attacking the walls of a fortified town.