1.
salted; containing salt
A product label meaning 'salt has been added.' Most commonly seen on butter, where 有塩バター is the default supermarket variety; contrasts with 無塩 (unsalted).
Compound of 有 (have/with) + 塩 (salt; えん in compounds, しお on its own). Used as a noun modifier with の or directly attached as a prefix-style label.