nMercaptal(Chem) Any one of a series of compounds of mercaptans with aldehydes.
Century Dictionary and Cyclopedia
nmercaptalThe name of a class of compounds containing the group , where R is any hydrocarbon radical and Alk is an alkyl-group such as methyl or ethyl. The compounds are oils with a highly offensive smell, and are also called thioacetals. They are related to mercaptan in the same way that the acetals are to alcohol.