Thomas Davidson,
Chambers's Twentieth Century Dictionary 1908…
(1908)
“ Instruc′tor:—fem. Instruc′tress. [L. instruĕre, instructum—in, in, struĕre, to pile up.] Instrument, in′strōō-ment, n. a tool or utensil: a machine producing musical sounds: a writing containing a contract: one who, or that which, is made a means.—adj. Instrument′al, acting as an instrument or means: serving to promote an object: helpful: belonging to or produced by musical instruments: (gram.) serving to indicate the instrument or means—of a case in Sanskrit, involving the notion of by or with.—ns. Instrument′alist, one who plays on a musical instrument ”
