Obs. [a. F. eventation, f. éventer: see prec.] A letting out, a drawing (of blood).
1544. Phaër, Regim. Lyfe (1560), O vj b. In suche cases, a litle eventacion of the infected bloude, maye bee the saving of their lyves.
[1611. Cotgr., Eventation, a venting; also, the opening of a veine.]
