A sentry, watch, or guard.
A unique string of characters recognised by a computer program for processing in a special way; a keyword.
A sentinel crab.
A sign of a health risk (e.g. a disease, an adverse effect).
To post as guard.
To post a guard for.
To watch over as a guard.
One who protects or defends.
A large expanse of exposed stable Precambrian rock.
A wide and relatively low-profiled volcano, usually composed entirely of lava flows.
Parts at the front and back of a vehicle which are meant to absorb the impact of a collision
A broad piece of defensive armor, held in hand, formerly in general use in war, for the protection of the body.
A spot resembling, or having the form of a shield.
A sign or symbol, usually containing numbers and sometimes letters, identifying a highway route.
A framework used to protect workmen in making an adit under ground, and capable of being pushed along as excavation progresses.
The escutcheon or field on which are placed the bearings in coats of arms.
A field of energy that protects or defends.
In lichens, a hardened cup or disk surrounded by a rim and containing the fructification, or asci.
A police badge.
To protect, to defend.
to protect from the influence of
To shelter; to protect oneself.