Partially fromμᾰ́γνητ-(mắgnēt-), the stem of theAncient Greekμᾰ́γνης(mắgnēs,“magnet”), and partially a combining form of theEnglishmagnet.

• (Received Pronunciation)enPR:măgnēt',IPA^(key):/maɡˌniːt/

magnet-

1. magnet,magnetic,magnetism

• When combined with a word or another affix which begins with a consonant, this prefixconcatenates with-o- (asmagneto-).

• “magneto-” listed in theOxford English Dictionary [2nd Ed.; 1989]
• “magneto-,comb. form” listed in theOxford English Dictionary [draft revision; June 2009]

• Getman