I. ˈsent-nəl, ˈsen-tə-nəl noun
Etymology: Middle French sentinelle, from Old Italian sentinella, from sentina vigilance, from sentire to perceive, from Latin
Date: 1579
: sentry
II. transitive verb
( -neled or -nelled ; -nel·ing or -nel·ling )
Date: 1593
1. : to watch over as a sentinel
2. : to furnish with a sentinel
3. : to post as sentinel