is·che·mi·a 
(ĭ-skēmē-ə)
(ĭ-skēmē-ə)n.
A decrease in the blood supply to a bodily organ, tissue, or part caused by constriction or obstruction of the blood vessels.
[New Latin ischaemia, from Greek iskhaimos, a stopping of the blood : iskhein, to keep back; see segh- in the Appendix of Indo-European roots + haima, blood.]
i·schemic adj.