10 letters · 14 points in Scrabble
noun an expert at calculation (or at operating calculating machines)
noun a small machine that is used for mathematical calculations
originIn the sense of a person, from Middle English calkelatour (“a mathematician, an astrologer”), borrowed from Latin calculātor, equivalent to calculate + -or. The other meanings arose in Modern English.
Etymology from Wiktionary, CC BY-SA 3.0