Refers to the historical ranged weapon. The synonym 石弓 (いしゆみ) is also used.
See also: 石弓 (いしゆみ)
Crossbows were widely used in medieval battles.
dreadnought class (warship)
strong bow; stiff bow
The kanji 弩 is a Chinese character originally meaning 'crossbow'. The reading ど is the on'yomi.