rolamite

noun

ro·​la·​mite

ˈrōləˌmīt

plural -s

: a nearly frictionless elementary mechanism consisting of two or more rollers inserted in the loops of a flexible metal or plastic band with the band acting to turn the rollers whose movement can be directed to perform various functions

Word History

Etymology

roll + -amite, of unknown origin

First Known Use

1968, in the meaning defined above

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