1. Of or relating to an elephant.
2. Enormous in size or strength: "the proliferation of superstores, superstadiums, [and] elephantine convention centers" (Herbert Muschamp).
3. Ponderously clumsy.

The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.