I. tes·ter ˈtēs-tər, ˈtes- 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. tes·ter ˈtes-tər noun
Etymology: modification of Middle French testart, from teston
Date: 1546
: teston a
III. test·er ˈtes-tər noun
Date: 1661
: one that tests or is used for testing