a person or thing that watches or stands as if watching.
a soldier stationed as a guard to challenge all comers and prevent a surprise attack:
to stand sentinel.
Digital Technology. tag1 (def 9a).
verb (used with object), sentineled, sentineling or (especially British) sentinelled, sentinelling.
to watch over or guard as a sentinel.
a person, such as a sentry, assigned to keep guard
(computing) a character used to indicate the beginning or end of a particular block of information
verb (transitive) -nels, -nelling, -nelled
to guard as a sentinel
to post as a sentinel
to provide with a sentinel
- Sentinel animal
noun 1. an animal that is placed in a given environment and then monitored to find out if an infectious disease or other harmful agent is present in that environment
- Sentinel gland
sentinel gland sen·ti·nel gland (sěn’tə-nəl) n. A single, enlarged lymph node in the omentum that may indicate an ulcer opposite to it in the greater or lesser curvature of the stomach.
- Sentinel pile
sentinel pile n. A thickening of the mucous membrane at the lower end of a fissure of the anus.
- Sentinel tag
sentinel tag n. A piece of projecting edematous skin at the lower end of an anal fissure.