American Heritage Dictionary
(2)
Century Dictionary
GNU Webster's 1913
WordNet
(2)
Elsewhere on the web
Here's a flaming mortarboard and a diploma I made out of old Filet O 'Fish wrappers.— Gawker
In a graduation picture, she has exchanged her hijab for a mortarboard.— Bloggers.Pakistan
On the one hand it's akin to a delicious Monty Python sketch - one could almost imagine John Cleese in a mortarboard doing his funny walk up to the podium.— Latest education news, including the university guide 2010, RAE results, higher and schools news, schools tables and further education | guardian.co.uk
Their playful paintings, which feature mythical creatures, colorful blobs and imaginary cities, are on the small side and mostly done on thick mortarboard, which doesn't require mounting.— SFGate: Top News Stories
The kids make drawings of Batman and unicorns on mortarboard that they sell on the street, and they even have the same pricing scheme as Bodelson and Wang -- $10 for the small ones, $20 for the big pieces.— SFGate: Top News Stories

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