long sword with bird-head pommel
Abbreviation of 鳥頭の太刀 (torigashira no tachi). Refers to a specific type of long sword with decorative bird-head carvings on the pommel. Rare, historical term.
See also: 鳥頭の太刀
鳥頭 is sometimes used as an abbreviation for 鳥頭の太刀 (a long sword with bird-head carvings).