TESTER

I. noun Etymology: Middle English, headboard of a bed, canopy, from Anglo-French, from teste head, from Late Latin testa skull, from Latin, shell Date: 14th century the canopy over a bed, pulpit, or altar, II. noun Etymology: modification of Middle French testart, from teston Date: 1546 teston a, III. noun Date: 1661 one that tests or is used for testing