Threshold

(thresh’ -old). The lower limit of stimulus capable of producing an impre ion upon consciousne . Thrill. A fine vibration felt by the hand. A thrill may be felt on palpation over an aneurysm, over a heart the seat of valvular disease, and over hydatid cysts. T., Purring, a thrill resembling that felt when the hand is placed on the back of a cat. 625