noun coil such that current is induced in it by passing a current through the primary coil
adjective being of second rank or importance or value; not direct or immediate
Similaralternateauxiliarycollateralindirectsecondhandsecond-stringstandbythirdhandtributaryutilityvicarious
Oppositesprimary
adjective inferior in rank or status
Similarjunior
adjective depending on or incidental to what is original or primary
Similarincidental
adjective not of major importance
Similarminor
adjective belonging to a lower class or rank
Similarsubordinate
Source: WordNet 3.1, Princeton University