離乳 is read as りにゅう (rinyuu) and means weaning.
りにゅう
rinyuu
りにゅうしょく
baby food
りにゅうき
weaning period
ちばなれ
weaning
はなれる
to leave
りこん
divorce
りりく
takeoff
はなす
to separate
りとう
secession from a political party
りだつ
withdrawal
leaving an island
りはん
estrangement
りちゃくりく
takeoff and landing