spherometer

About 0.01 uses per million words.

Meaning

1. noun A device used to measure the curvature of a surface, such as a lens.

   More precisely, a spherometer directly measures a sagitta (distance between a point and a chord), allowing the radius of curvature to be calculated.

Similar words

spherocylinder spherograph spherics spherical mirror spheroscope spheroconic spherical aberration sphericality spherical geometry sphericity

Often followed by

is on and readings can screw

Word family

spherometers