Webster's Revised Unabridged Dictionary · 1913

Capon

Capon (kā"p'n or kā"pun; 277) , noun

[Old English capon, chapoun, Anglo-Saxon capūn (compare French chapon), Latin capo, from Greek ka`pwn akin to ko`ptein to cut, OSlav. skopiti to castrate. Compare Comma.]

A castrated cock, esp. when fattened; a male chicken gelded to improve his flesh for the table. — Shakespeare
The merry thought of a capon. — W. Irving

Capon , transitive verb

To castrate; to make a capon of.