homopolar
adjective
ho·mo·po·lar ˌhō-mə-ˈpō-lər 
ˌhä-
1
of a motor or generator : using or producing direct current without the use of commutators
2
: of or relating to a union of atoms of like polarity : nonionic
Word History
First Known Use
1896, in the meaning defined at sense 1