THIOL Meaning of THIOL in English ˈthīˌȯl, -ˌōl noun( -s )Etymology: International Scientific Vocabulary thi- + -ol 1. : mercaptan2. : the mercapto group• thi·ol·ic (ˈ) ̷ ̷| ̷ ̷ik adjective Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012