48-verse renku form
A rare, technical term in Japanese linked verse (renku). Refers to a specific form consisting of 48 verses. Contrast with 短歌行 (a shorter form) and 連句 (the broader category).
Chōkakō is a form of renku consisting of 48 verses.
From 長 (long) + 歌行 (song/verse form). The exact historical derivation is uncertain; the term is a technical label for a specific renku structure.