SUBSTAGE
\sˈʌbste͡ɪd͡ʒ], \sˈʌbsteɪdʒ], \s_ˈʌ_b_s_t_eɪ_dʒ]\
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sub'st[=a]j, n. an attachment below the stage of the compound microscope, to support the achromatic condenser, &c.
By Thomas Davidson
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The accessory parts of a microscope situated beneath the stage; used for illuminating or in other ways facilitating the examination of an object.
By Alexander Duane
By Willam Alexander Newman Dorland