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.

1570–80; < Middle French sentinelle < Italian sentinella, derivative of Old Italian sentina vigilance (Latin sent(īre) to observe) + -īna -ine2)

sentinellike, adjective
sentinelship, noun
unsentineled, adjective
unsentinelled, adjective

1, 2. sentry, guard, watch, lookout. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sentinel (ˈsɛntɪnəl)
1.  a person, such as a sentry, assigned to keep guard
2.  computing a character used to indicate the beginning or end of a particular block of information
vb , -nels, -nelling, -nelled
3.  to guard as a sentinel
4.  to post as a sentinel
5.  to provide with a sentinel
[C16: from Old French sentinelle, from Old Italian sentinella, from sentina watchfulness, from sentire to notice, from Latin]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1579, from M.Fr. sentinelle, from It. sentinella, perhaps (via a notion of "perceive, watch"), from sentire "to hear, perceive," from L. senire "feel" (see sense).
Online Etymology Dictionary, © 2010 Douglas Harper
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