D defs.my
Entry 3 senses Webster, 1913

Apparatus

/ăpˌ-ẽr-ăt'-əs/ · Ap·pa·ratus · IPA /ˌæp.əˈɹeɪ.təs/
01 n. Things provided as means to some end.
pl. Apparatus, Apparatuses
  1. 1.
    Things provided as means to some end.
  2. 2.
    Hence: A full collection or set of implements, or utensils, for a given duty, experimental or operative; any complex instrument or appliance, mechanical or chemical, for a specific action or operation; machinery; mechanism.
  3. 3.
    A collection of organs all of which unite in a common function; as, the respiratory apparatus.(Physiol.)