Sentinel
来自Big Physics
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late 16th century: from French sentinelle, from Italian sentinella, of unknown origin.
wiktionary
1570s, from Middle French sentinelle, from Old Italian sentinella (perhaps via a notion of " perceive, watch", compare Italian sentire(“to feel, hear, smell”)), from Latin sentiō(“feel, perceive by the senses”). See sense.
etymonline
sentinel (n.)
1570s, from French sentinelle (16c.), from Italian sentinella "a sentinel." OED says "No convincing etymology of the It. word has been proposed," but perhaps (via a notion of "perceive, watch"), from sentire "to hear," from Latin sentire "feel, perceive by the senses" (see sense (n.)).
