TORRICEL'LIAN, adjective Pertaining to Torricelli, an Italian philosopher and mathematician, who discovered the true principle on which the barometer is constructed.

Torricellian tube, is a glass tube thirty or more inches in length, open at one end, and hermetically sealed at the other.

Torricellian vacuum, a vacuum produced by filling a tube with mercury, and allowing it to descend till it is counterbalanced by the weight of an equal column of the atmosphere, as in the barometer.