Blood (n)
Old English blod “blood,” from P.Gmc. *blodam “blood” (cf. Old Frisian blod, Old Saxon blôd, Old Norse bloð, Middle Dutch bloet, Dutch bloed, Old High German bluot, German Blut, Gothic bloþ), from PIE *bhlo-to-, perhaps meaning “to swell, gush, spurt,” or “that which bursts out” (cf. Gothic bloþ “blood,” bloma “flower”), in which case it would be from suffixed form of *bhle-, extended form of *bhel- (2) “to blow, inflate, swell”