paraffin UK /ˈpæɹ.ə.fɪn/US /ˈpɛɹ.ə.fɪn/noun 3verb 2forms 3 noun3 •(UK, Ireland) A petroleum-based thin and colourless fuel oil.She poured paraffin on the dry floors and on the pandanus-mats, and then she set fire. — 1919 •Paraffin wax. •Any member of the alkane hydrocarbons. verb2 •To impregnate or treat with paraffin. •To embed in paraffin wax. formsparaffined · paraffining · paraffins