BUFFY

COAT, n. Bu®f’fi2-ko%t. Gr., Xéprov droyiotixdy. Lat., crusta in flamm at or i a (seu pleuritiea). ” Fr., couenne in flamm a: toire (on pleurétique). Ger., Speckhaut. It., cotenna inf i am mat or i a. Sp., costra in flam at or i a. A peculiar yellowish-white or grayish crust observed on coagulating blood under certain conditions (when coagulation is retarded or when the blood contains an exce of fibrin), formerly considered to be diagnostic of inflammation. The surface is often concave, and the elot is then said to be “eupped.” The formation of the b. c. is due to a more or le complete subsidence of the red corpuscles before coagulation takes place. [A, 801; K.]