14 letters · 27 points in Scrabble
noun a salt of phosphoric acid
originEtymology tree Proto-Indo-European *h₃erdʰ-der. Proto-Hellenic *ortʰwós Ancient Greek ὀρθός (orthós)lbor. English ortho- English phosphate English orthophosphate From ortho- + phosphate.
Etymology from Wiktionary, CC BY-SA 3.0