TITLE: What is the origin of the term magma?
QUESTION [10 upvotes]: Wikipedia credits Bourbaki with coining it, but doesn't provide a source. Does anyone happen to know the motivation for using this term?

REPLY [4 votes]: Wikipedia also says that "magma" is used by Serre in his book Lie algebras and lie groups: 1964 Lectures given at Harvard University.  This seems to be the case (at least for the 1992 Springer reprint that I have access to.)  Is this the earliest use in print of "magma" in this sense?