1. (pr. cock-six) Medical term for tailbone. Small triangular bone found at the base of the spine. The number of sections in normal humans vary from 1-3.
I was doing some backyard wrestlingand when I jumped off my roof I broke my coccyx.
by The Troll July 17, 2005
1 more definition
tail bone; what Grandma broke.
Uncle Rico: Grandma took a little spill at the sand dunes today. Broke her COCCYX.
by pimps ahoy August 07, 2005