A sentry, watch, or guard. / (obsolete) A private soldier. / (computer science) A unique string of characters recognised by a computer program for processing in a special way; a keyword.

(transitive) To watch over as a guard. / (transitive) To post as guard. / (transitive) To post a guard for.

plural of sentinel

present participle of sentinel

simple past tense and past participle of sentinel

present participle of sentinel

simple past tense and past participle of sentinel

Provided with a sentinel.

A ghost town in California. / A town in Oklahoma.

(medicine) Any unanticipated or unusual event in a medical setting which results in death or serious physical injury to a person or persons, specifically including limb loss or gross motor function.