noun.
One who tests, tries, assays, or proves.
noun.
Any instrument or apparatus used in testing: as, a steam-gage tester; a vacuum-tester.
noun.
A name given to the shillings coined by Henry VIII., and to sixpences later (compare teston); also, in modern slang, a sixpence.
noun.
A canopy.
noun.
Specifically— The frame which connects the tops of the posts in a four-post bedstead, and the material stretched upon it, the whole forming a sort of canopy.
noun.
In architecture, a flat canopy, as over a pulpit or a tomb.
noun.
A head-piece; a helmet.