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sentry[sentry 词源字典]

sentry: [17] Sentry is probably short for the now obsolete centrinell ‘sentry’. This first appeared in the 16th century as a variant of sentinel [16], which came via French sentinelle from Italian sentinella. It is not altogether clear where the Italian noun came from, but it may well have been derived from the verb sentire ‘perceive, watch’, a descendant of Latin sentīre ‘feel’ (from which English gets sense, sentence, sentiment, etc).
=> sentinel[sentry etymology, sentry origin, 英语词源]