Definitions from Wiktionary (Sentinel)

▸ noun:  A sentry, watch, or guard.
▸ noun:  (obsolete) A private soldier.
▸ noun:  (computer science) A unique value recognised by a computer program for processing in a special way, or marking the end of a set of data.
▸ noun:  A sentinel crab.
▸ noun:  (attributive, medicine, epidemiology) A sign of a health risk (e.g. a disease, an adverse effect).
▸ noun:  (figuratively) Someone who is hardworking and dutiful.
▸ verb:  (transitive) To watch over as a guard.
▸ verb:  (transitive) To post a guard for.
▸ noun:  A place in the United States:
▸ noun:  An unincorporated community in Maricopa County, Arizona.
▸ noun:  A ghost town in Fresno County, California.
▸ noun:  An unincorporated community in Polk County, Missouri
▸ noun:  A town in Washita County, Oklahoma.
▸ Also see sentinel

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