One that keeps guard; a sentry.
tr.v. sen·ti·neled, sen·ti·nel·ing, sen·ti·nels or sen·ti·nelled or sen·ti·nel·ling
1. To watch over as a guard.
2. To provide with a guard.
3. To post as a guard.
[French sentinelle, from Italian sentinella, probably from Old Italian sentina, vigilance, from sentire, to watch, from Latin sentīre, to feel; see sent- in the Appendix of Indo-European roots.]
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Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.