First Known Use: 1579
Dictionary
1sentinel
noun sen·ti·nel \ˈsent-nəl, ˈsen-tə-nəl\
Definition of SENTINEL
: sentry
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Origin of SENTINEL
Middle French sentinelle, from Old Italian sentinella, from sentina vigilance, from sentire to perceive, from Latin
Related to SENTINEL
2sentinel
transitive verb
sentineled or sentinelledsentinel·ing or sentinel·ling
Definition of SENTINEL
1
: to watch over as a sentinel
2
: to furnish with a sentinel
3
: to post as sentinel
First Known Use of SENTINEL
1593
SENTINEL Defined for Kids
sentinel
noun sen·ti·nel \ˈsen-tə-nəl\
Definition of SENTINEL for Kids
: sentry
Medical Dictionary
sentinel
adjective sen·ti·nel \ˈsent-ən-əl\
Medical Definition of SENTINEL
: being an individual or part of a population potentially susceptible to an infection or infestation that is being monitored for the appearance or recurrence of the causative pathogen or parasite
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