Tŏr'ri-çĕl'li-an, a.

a. Of, or pertaining to, Torricelli, an Italian philosopher and mathematician, who discovered the principle on which the barometer is constructed.

Torricellian tube, a glass tube thirty or more inches in length, open at one end, and hermetically sealed at the other, such as is used in the barometer.—Torricellian vacuum, a vacuum produced by filling with a fluid, as mercury, a tube hermetically closed at one end, and, after immersing the other end in a vessel of the same fluid, allowing the inclosed fluid to descend till it is counterbalanced by the weight of an equal column of the atmosphere, as in the barometer. Hutton.