Senses
保长/ 保長 head of a bao
Head of a 保 (a group of households) in the ancient 保甲 administrative system; a local constable.
保长/ 保長 isometric
(math) Distance-preserving or isometric.
保长/ 保長 day-call of a phoenix
(literary) The specific name for the call of a phoenix when heard during the day.