e·de·ma also oe·de·ma (ĭ-dēmə)
n. pl. e·de·mas or e·de·ma·ta (-mə-tə) also oe·de·mas or oe·de·ma·ta
1. Medicine An excessive accumulation of serous fluid in tissue spaces or a body cavity.
2. Botany A condition of plants characterized by blisterlike swellings on the leaves or other parts, caused by an accumulation of water.
[Middle English ydema, from Greek oidēma, a swelling, from oidein, to swell.]
e·dema·tous (ĭ-dĕmə-təs) adj.
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.