noun Date: 1888 an attachment to a microscope by means of which accessories (as mirrors, diaphragms, or condensers) are held in place beneath the stage of the instrument
SUBSTAGE
Meaning of SUBSTAGE in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012