s, a, o, e, l, n, p, c, m, r, t, i, u are letters that make 'optical instrument'
ti, strum, NT, INS, men, rumen, IC, opt, tical, en, rum, inst, ic, optical, optic, in, instrument, AL, CA, IN, ME, tic, Al, Ca, In, Pt, Ru, Ti are words within 'optical instrument'
1 possible definitions for 'optical instrument'
Under this definition, optical instrument is a noun and has the following properties:
'optical instrument' can be a type of instrument.
binoculars, field glasses, opera glasses, esophagoscope, oesophagoscope, jeweler's glass, periscope, projector, sights, spectacles, specs, glasses, spectroscope, prism spectroscope, eyeglasses are types of 'optical instrument'.
lens, lense, lens system are parts of 'optical instrument'.