I know Google is my friend..

[pat]

... but it still has not helped me answer this question:

What is the plural of alma mater? Does the designation apply to graduate schools one attended? (So one could in fact have more than one of them?)

Comments

[wcg.livejournal.com]

Yes, that's what I was going to recommend too. Matres is the plural of mater, and alma pluralizes as almae.