Search Result for "frictionless": 
Wordnet 3.0

ADJECTIVE (1)

1. lacking all friction;
- Example: "a perpetual motion machine would have to be frictionless"



The Collaborative International Dictionary of English v.0.48:

Frictionless \Fric"tion*less\, a.
   Having no friction.
   [1913 Webster]


WordNet (r) 3.0 (2006):

frictionless
    adj 1: lacking all friction; "a perpetual motion machine would
           have to be frictionless"