The word "sentinel" refers to a guard or a watchful being that stands watch or keeps an eye on something. Originating from the idea of vigilance, a sentinel typically monitors for any signs of danger or change, serving as a protector or a lookout. This word can be used in various contexts, from military settings to general descriptions of someone or something that provides alertness or oversight.
The term "sentinel" comes from the Middle French word "sentinelle," which is derived from the Italian "sentinella," and ultimately from the Latin verb "sentire," meaning "to feel" or "to perceive." This lineage emphasizes the role of a sentinel as one who perceives or watches over.