Etymology
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ischemia (n.)

also ischaemia, 1866 (but as far back as 1660s in form ischaimes), from medical Latin ischaemia, from ischaemus "stopping blood," from Greek iskhaimos "stanching or stopping blood," from iskhein "to hold, curb, keep back, restrain" (from PIE *si-sgh-, reduplication of root *segh- "to hold" (from PIE root *segh- "to hold") + haima "blood" (see -emia). Related: Ischemic.

updated on May 22, 2017

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Definitions of ischemia from WordNet

ischemia (n.)
local anemia in a given body part sometimes resulting from vasoconstriction or thrombosis or embolism;
Synonyms: ischaemia
From wordnet.princeton.edu, not affiliated with etymonline.