azeotrope
noun
azeo·trope ˈā-zē-ə-ˌtrōp 
: a liquid mixture that is characterized by a constant minimum or maximum boiling point which is lower or higher than that of any of the components
Word History
Etymology
a- entry 2 + Greek ze-, stem of zéō, zeîn "to boil, seethe" + -o- + -trope, after earlier azeotropic "having the characteristics of an azeotrope" — more at yeast entry 1
Note: The term azeotropic was introduced by the English chemist John Wade (1864-1912) and his coworker Richard Willliam Merriman in "Influence of Water on the Boiling Point of Ethyl Alcohol at Pressures Above and Below the Atmospheric Pressure," Journal of the Chemical Society - Transactions, vol. 99 (1911), p. 1004.
First Known Use
1915, in the meaning defined above
Medical Definition
azeotrope
noun
azeo·trope ā-ˈzē-ə-ˌtrōp
: a liquid mixture that is characterized by a constant minimum or maximum boiling point which is lower or higher than that of any of the components and that distills without change in composition