• Webster's Revised Unabridged Dictionary
    • n Mercaptal (Chem) Any one of a series of compounds of mercaptans with aldehydes.
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Century Dictionary and Cyclopedia
    • n mercaptal The 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.
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Webster's Revised Unabridged Dictionary
Mercapt,an + al,dehyde