noun
Refers to thickened, hardened skin from repeated friction or pressure, such as on hands or feet. In everyday use, たこ is the standard term.
ギターを弾きすぎて指にたこができた。
I got a callus on my finger from playing the guitar too much.
新しい靴で歩いたら、かかとにたこができて痛い。
After walking in new shoes, I got a corn on my heel and it hurts.
Rarely used kanji form.
The origin is uncertain; it may be related to the word for octopus (蛸/たこ) due to a perceived resemblance, but this is speculative.