刀
1
sword (esp. Japanese single-edged);katana
「刀の投擲の練習？」「すっぽ抜けただけです」
"Practising sword throwing?" "It just slipped out of my hands."
2
only applies to
とう
scalpel
3
only applies to
とう
chisel;burin;graver
See also:
彫刻刀 (ちょうこくとう)
4
only applies to
とう
knife money (knife-shaped commodity money used in ancient China)
See also:
刀銭 (とうせん)