7 letters · 9 points in Scrabble
adjective (of a substance) capable of being dissolved in some solvent (usually water)
adjective susceptible of solution or of being solved or explained
originFrom Middle English soluble, from Old French soluble, from Late Latin solūbilis, from Latin solvere (“to loosen”) + -bilis. Piecewise doublet of solvable.
Etymology from Wiktionary, CC BY-SA 3.0