Since 2004, ODELIF, the Oxford English Dictionary in Limerick Form has been assembling limerick definitions of English words. I learned about this amazing project in the Washington Post -- in a weekly column by Pat Myers entitled "The Style Invitational". Each year, Myers invites readers to submit limericks that define terms in a particular alphabetic range. This year's contest requested limericks that define words beginning with gl- to go-. Follow this link (and scroll) down to see some of the winners (announced this past weekend).
Alas, none of the winning limericks involved math terms, and so I offer here one of my non-winning submissions.
When you have time, visit ODELIF -- browse its limerick offerings and consider contributing some of your own. And, if you like, add limericks here via your comments below.