work done for free, unpaid work, uncompensated work / work done in vain, work with no favorable end result

to work for free, to work without pay or other compensation / to work in vain, to work with no favorable end result

(archaic, grammar) any word that declines or conjugates / (archaic, grammar) more specifically, a verb

pediatrics, either as a course of study or a department of a hospital

(taxonomy) subfamily

(medicine) short for 耳鼻咽喉科学(じびいんこうかがく) (jibi-inkō-ka-gaku): study of the ear and nose, otorhinolaryngology

sworn elder brother / (gay slang) older male in a homosexual relationship

a small hawk / a male hawk / musket, male sparrowhawk

older paternal half brother

(honorific) older brother