|byüd.ər+ noun
( -s )
Etymology: International Scientific Vocabulary butyr- + aldehyde
: either of the two aldehydes C 3 H 7 CHO corresponding to the two butyric acids ; especially : normal butyric aldehyde CH 3 CH 2 CH 2 CHO obtained as a pungent flammable liquid by partial hydrogenation of crotonaldehyde or by dehydrogenation of normal butyl alcohol and used chiefly in making polyvinyl butyral resins for safety glass and condensation products (as with aniline) for rubber accelerators