sentinel

The story

1. Old Italian · derived fromsentinella
2. Middle French · derived fromsentinelle“watch or guard kept by a soldier”
3. English todaysentinel

First attested in the 1570s from Middle French sentinelle (“watch or guard kept by a soldier”), from Old Italian sentinella, probably from sentina + -ella, from sentire (“perceive, watch, hear”), from sentiō (“feel, perceive by the senses”). See also sense, sentient.