Definition of «sentinel»

A sentinel is a person or thing that stands guard, watching and protecting an area, object, or group. It can also refer to an early warning system designed to detect potential threats or problems before they become serious issues. In biology, a sentinel species refers to a particular organism whose health can be used as an indicator of the overall health of its ecosystem.

Usage examples

A sentinel was stationed at the entrance of the castle, guarding it day and night.
The security system acted as a sentinel, monitoring any suspicious activities in the building.
The lighthouse served as a sentinel, guiding ships safely through the treacherous waters.
The watchdog acted as a sentinel, barking loudly to warn the owners of any approaching danger.
The tall trees acted as sentinels, standing watch over the forest and protecting it from intruders.

Phrases with «sentinel»

Sentences with «sentinel»

This year's total was a 61.5 percent increase, according to a Sun Sentinel analysis of pending suits entered by attorneys into the Florida Department of Financial Services» Legal Service of Process database. (sun-sentinel.com)
Other future products are expected to be entirely new — plants that can serve as sentinels of environmental contamination, for example, and collections of microorganisms that can produce chemical compounds efficiently. (sciencedaily.com)
As the Orlando Sentinel reported in early September, where once non-profits focused on assisting unemployed persons, today the focus has shifted to providing jobs. (blog.simplyhired.com)
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Definition of «sentinel»

Usage examples

Phrases with «sentinel»

Sentences with «sentinel»

See also