tester

tester is a   Noun

Definition:

[1] A headpiece; a helmet. [Obs.] The shields bright, testers, and trappures. Chaucer.

[2] A flat canopy, as over a pulpit or tomb. Oxf. Gross.

[3] A canopy over a bed, supported by the bedposts. No testers to the bed, and the saddles and portmanteaus heaped on me to keep off the cold. Walpole.

Synonyms: