quad·rate (kwŏdrāt′, -rĭt)
a. A square or cube.
b. An approximately square or cubic area, space, or object.
2. Zoology A bone or cartilaginous structure of the skull, joining the upper and lower jaws in birds, fish, reptiles, and amphibians.
1. Having four sides and four angles; square or rectangular.
2. Zoology Of or being the quadrate bone or cartilage.
[Middle English quadrat, something square, from Latin quadrātum, from neuter past participle of quadrāre, to make square, from quadrum, square; see kwetwer- in the Appendix of Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.