Webster's English Dictionary

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sentinel

1. sen.ti.nel \'sent-n*l, -*n-*l\ n [MF sentinelle, fr. OIt sentinella, fr. 
   sentina vigilance, fr]. sentire to perceive, fr. L : one that watches or 
   guards : SENTRY 
2. sentinel vt or sen.ti.neled or sen.ti.nelled;  or sen.ti.nel.ing;  or 
   sen.ti.nel.ling 1: to watch over as a sentinel  2: to furnish with a 
   sentinel  3: to post as sentinel