CMU English Pronouncing Dictionary Dictionary [with local updates] CMU Pronouncing Dictionary
WordNet (3.0) WordNet (3.0)
(adj) lacking all friction, Example:a perpetual motion machine would have to be frictionless
The Collaborative International Dictionary of English (GCIDE) v.0.53 Collaborative International Dictionary (GCIDE)
a. Having no friction. [ 1913 Webster ]
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