auxiliary

adj. helpful, supporting; additional

n. assistant, aide

Auxiliary may refer to:A backup systemAn auxiliary input. See Scart and Jack (connector).An auxiliary verbAuxiliary policeTroops supporting the main force of an army - see auxiliariesArmed Forces auxiliaryAuxiliary route of the Interstate Highway System ("three-digit Interstate")Auxiliaries (Roman military)
See more at Wikipedia.org...

Noun
1. someone who acts as assistant
(synonym) aide
(hypernym) assistant, helper, help, supporter
(hyponym) nursing aide, nurse's aide
Adjective
1. functioning in a subsidiary or supporting capacity; "the main library and its auxiliary branches"
(synonym) subsidiary, supplemental, supplementary
(similar) secondary
2. relating to something that is added but is not essential; "an ancillary pump"; "an adjuvant discipline to forms of mysticism"; "The mind and emotions are auxilliary to each other"
(synonym) accessory, adjunct, ancillary, adjuvant, appurtenant, subsidiary
(similar) supportive

(sing.)
A verb which helps to form the voices, modes, and tenses of other verbs; -- called, also, an auxiliary verb; as, have, be, may, can, do, must, shall, and will, in English; etre and avoir, in French; avere and essere, in Italian; estar and haber, in Spanish.
  

(sing.)
A quantity introduced for the purpose of simplifying or facilitating some operation, as in equations or trigonometrical formulae.
  

(n.)
Foreign troops in the service of a nation at war; (rarely in sing.), a member of the allied or subsidiary force.
  

(n.)
A helper; an assistant; a confederate in some action or enterprise.
  

(a.)
Conferring aid or help; helping; aiding; assisting; subsidiary; as auxiliary troops.
  

1
adjective
which helps; the hospital has an auxiliary power supply in case the electricity supply breaks down
2
noun
assistant
nursing auxiliary = helper who does general work in a hospital, clinic