checker

IPA: tʃˈɛkɝ

One who or that which checks or verifies something.
One who makes a check mark.
The clerk who tallies cost of purchases and accepts payment.
One who hinders or stops something.
A playing piece in the game of checkers (British: draughts).
A pattern of alternating colours as on a chessboard.
An individual square appearing in such a pattern.
The fruit of the wild service tree or chequer tree, Photinia villosa, syn. Sorbus terminalis

(transitive) To mark in a pattern of alternating light and dark positions, like a checkerboard.
(intransitive) To develop markings in a pattern of alternating light and dark positions, like a checkerboard.

Examples of "checker" in Sentences

The third job, fact checker, is admittedly not as important.
Besides Julie, my spelling and grammar checker is my other guide.
(I'm a terrible speller and my spell checker is woefully inadequate!)
Josh: Actually, watching the path of his checker is like trying to figure out an M.C. Escher painting.
Attention aspiring writers — Christopher has a good post illustrating why spell checker is not enough.
As those 7 little dwarfs (man, my spell-checker is going bonkers over "dwarfs") would say, it's off to work I go.
Become a label checker and edit your shopping list: a good rule of thumb is the fewer and simpler the ingredients the better.
I don't believe that ... it must have all evaporated away again (or else the morning report weather checker is lying through her teeth) because it was raining (HARD) for a solid hour, and then dripping for another hour.