sage

(noun) a mentor in spiritual and philosophical topics who is renowned for profound wisdom.

(noun) aromatic fresh or dried grey-green leaves used widely as seasoning for meats and fowl and game etc.

(noun) any of various plants of the genus Salvia; a cosmopolitan herb. Synonyms: salvia.

(adj) having wisdom that comes with age and experience.

(adj) of the grey-green color of sage leaves. Synonyms: sage-green.