兜

helmet (of a warrior); headpiece

rhinoceros beetle (esp. the Japanese rhinoceros beetle, Trypoxylus dichotomus)

steel helmet

tokin; small black headgear worn by yamabushi

Kabutochō (neighbourhood of Nihonbashi, Tokyo, where the Tokyo Stock Exchange is located)

Colloquial

Tokyo Stock Exchange

horseshoe crab

Word usually written using kana alone

aconite (esp. species Aconitum japonicum); wolfsbane; monkshood

traditional bugaku hat

spiked helmet

Buddhism

Tusita heaven (one of the six heavens of the desire realm); Tushita

inside of a helmet; hidden circumstances

Abbreviation; Buddhism

Tusita (heaven, pure land)

helmet-shaped hood

Word usually written using kana alone

large-headed midnight fish (Poromitra crassiceps)

armored fish; armoured fish

tadpole shrimp (Triopsidae spp.); shield shrimp

to accept one's inferiority; to take one's hat off to someone

to give up; to surrender; to strike one's colors

Hercules beetle (Dynastes hercules)

Proverb

do not let your guard down after a victory; tighten the strings of your helmet after winning

Food, cooking

broiled fish head (esp. sea bream)

Pandanus boninensis (species of screw pine)

Slang

frot (sex act)

Food, cooking

simmered fish head (oft. sea bream)

Historical term

zunari helmet (made from 3-5 pieces of metal)