An Etymological Dictionary of Astronomy and Astrophysics

An appliance or device for a particular purpose: an X-ray apparatus. An integrated group of materials or devices used for a particular purpose.

Etymology (EN): From L. apparatus “equipment, preparation,” from p.p. of apparare “to prepare,” from ad- “to” + parare “make ready”.

Etymology (PE): Dastgâh “any manufacturing instrument, a loom; ustensils”.