Apparatus

n. pl. Apparatus, also rarely Apparatuses ().

1. Things provided as means to some end.
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. (Physiol.) A collection of organs all of which unite in a common function; as, the respiratory apparatus.