in Surgery, a fitful instrument, usually made of silver, to be introduced into the bladder, in order to search for the stone, or discharge the urine when suppressed. See Surgery Index.

CATETUS, in Geometry, a line or radius falling perpendicularly on another line or surface; thus the catheti of a right-angled triangle are the two sides that include the right angle.

CATETUS of Incidence, in Catoptries, a right line drawn from a point of the object, perpendicular to the reflecting line.

CATETUS of Reflection, or of the Eye, a right line drawn from the eye perpendicular to the reflecting plane.

CATETUS of Obliquation, a right line drawn perpendicular to the speculum, in the point of incidence or reflection.

CATETUS, in Architecture, a perpendicular line, supposed to pass through the middle of a cylindrical body, as a balluster, column, &c.