sentry
SEN-tree · noun
Origin
Sentry comes from earlier forms sentrie or sentery, and no one is fully sure where it originated. It may be an alteration of sentinel or sanctuary, or it may descend from Old French senteret, meaning 'a path,' itself a diminutive of sentier, from Medieval Latin semitarius.
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Related words
If the path theory is right, sentry shares distant roots with sentier, the Old French word for a footpath, by way of Medieval Latin semitarius.