sentinel
Pronunciation:
/ˈsɛntɪnəl/noun
Definitions
A sentry, watch, or guard.
A private soldier.
A unique string of characters recognised by a computer program for processing in a special way; a keyword.
Example: The tag is a sentinel that suspends web-page processing and displays the subsequent text literally.
A sentinel crab.
verb
Definitions
To watch over as a guard.
Example: He sentineled the north wall.
To post as guard.
Example: He sentineled him on the north wall.
To post a guard for.
Example: He sentineled the north wall with just one man.