noun, plural edemas, edemata [ih-dee-muh-tuh] . Pathology.
effusion of serous fluid into the interstices of cells in tissue spaces or into body cavities.
Plant Pathology.
a small surface swelling of plant parts, caused by excessive moisture.
any disease so characterized.
Also, oedema.

1490–1500; < Neo-Latin oedēma < Greek oídēma a swelling, equivalent to oidē- (variant stem of oideîn to swell) + -ma noun suffix

edematous [ih-dem-uh-tuhs, ih-dee-muh-] , edematose [ih-dem-uh-tohs, ih-dee-muh-] , adjective
pseudoedema, noun, plural pseudoedemata.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
edema (ɪˈdiːmə)
n , pl -mata
the usual US spelling of oedema

oedema or edema (ɪˈdiːmə)
n , pl -mata
1.  pathol an excessive accumulation of serous fluid in the intercellular spaces of tissue
2.  plant pathol an abnormal swelling in a plant caused by a large mass of parenchyma or an accumulation of water in the tissues
[C16: via New Latin from Greek oidēma, from oidein to swell]
edema or edema (ɪˈdiːmə, -mətə)
[C16: via New Latin from Greek oidēma, from oidein to swell]
oedematous or edema
edematous or edema
oe'dematose or edema
e'dematose or edema

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

c.1400, from Gk. oidema (gen. oidematos) "a swelling tumor," from oidein "to swell," from oidos "tumor, swelling," from PIE *oid- "to swell;" cf. L. aemidus "swelling," O.N. eista "testicle," O.E. attor "poison" (that which makes the body swell), and the first element in Oedipus.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

edema e·de·ma (ĭ-dē'mə)
n. pl. e·de·mas or e·de·ma·ta (-mə-tə)
An accumulation of an excessive amount of watery fluid in cells, tissues, or serous cavities.

edematous e·dem·a·tous (ĭ-děm'ə-təs)
Marked by edema.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
edema   (ĭ-dē'mə)  Pronunciation Key 
An accumulation of an excessive amount of watery fluid in cells, tissues, or body cavities. Edema can be mild and benign as in pregnancy or prolonged standing in the elderly, or a serious sign of heart, liver, or kidney failure, or of other diseases.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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