geometer

noun

Etymology: From Middle English gemeter, geometer, ultimately from Late Latin geōmetrēs, from Ancient Greek γεωμέτρης (geōmétrēs), from γῆ (gê, “earth”) + μετρέω (metréō, “to measure”).

1. A mathematician who specializes in geometry.

   “But this idea, which is a general postulate in all demonstrations, has been taken for granted by every algebrician and geometer.”

2. Any species of geometrid moth (family Geometridae).