rhombus

rhom·bus Audio Help (rŏm'bəs)

n. pl. rhom·bus·es or rhom·bi (-bī)
An equilateral parallelogram.

[Late Latin, from Latin, flatfish, magician's circle, from Greek rhombos, rhombus; see wer-² in Indo-European roots.]

(Download Now or Buy the Book)
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2000 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.