9 letters · 13 points in Scrabble
noun an instrument that measures rate of evaporation of water
originEtymology tree English atmo- Proto-Indo-European *meh₁- Proto-Indo-European *-tḗr Proto-Indo-European *-trom Proto-Hellenic *-tron Ancient Greek -τρον (-tron) Ancient Greek μέτρον (métron)der. English -meter English atmometer From atmo- + -meter.
Etymology from Wiktionary, CC BY-SA 3.0