geometrician
geo·met·ri·cian
noun
1.
a mathematician specializing in geometry
Origin
From geometric + -ian, presumably by analogy with other words in -ician, such as mathematician.
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WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.