a.1.Pertaining to microscopy, or to the use of the microscope.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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All tubes should accept the standard 23-mm eyepiece as a slip fit at one end and the Royal Microscopal Society (RMS) thread, a 0.800 inch 36 TPI Whitworth thread, at the objective end.