Definition of mercaptal in English:

mercaptal

Pronunciation /məːˈkapt(ə)l/ /məːˈkaptal/

noun

Chemistry
  • Any of a series of compounds with the general formula RCH(SR′) ₂, formed by the acid-catalysed reaction of a thiol (mercaptan) with an aldehyde.

Origin

Late 19th century; earliest use found in Matthew Muir (1848–1931). From mercapt- + -al.