Search Result for "synchromesh": 
Wordnet 3.0

NOUN (1)

1. an automotive system for shifting gears in which the gears revolve at the same speed and so shift smoothly; 



WordNet (r) 3.0 (2006):

synchromesh
    n 1: an automotive system for shifting gears in which the gears
         revolve at the same speed and so shift smoothly