D defs.my
Entry 1 sense Webster, 1913

blowby

/(blō"bī`)/ · blow·by · IPA
01 n. the leakage of gases from the combustion cylinder of an internal combustion engine between the piston and cylinder wall into the crankcase.
  1. 1.
    the leakage of gases from the combustion cylinder of an internal combustion engine between the piston and cylinder wall into the crankcase.