geometrician

The geometrician proceeds in this manner: he defines the cone, an ideal conception; then he intersects it by a plane.

Andreyev's father, who was a geometrician, died while he was still at school, and the family was without resources.

Montesquieu encountered a geometrician outside a coffee house on the Pont Neuf, and accompanied him inside.

Is not the same person best able to speak falsely or to speak truly about diagrams; and he is—the geometrician?

O my dear Theodorus, do my ears truly witness that this is the estimate formed of them by the great calculator and geometrician?