Merriam-Webster Collegiate Dictionary - sol

 noun  Etymology: Middle English, from Latin  Date: 15th century  1. the Roman god of the sun — compare Helios  2. sun SOL  I. noun  also so  Etymology: Medieval Latin ~; from the syllable sung to this note in a medieval hymn to Saint John the Baptist  Date: 14th century the fifth tone of the diatonic scale in ~mization  II. noun  Etymology: Middle French — more at sou  Date: 1583 an old French coin equal to 12 deniers; also a corresponding unit of value  III. noun  (plural ~es)  Etymology: American Spanish, from Spanish, sun, from Latin  Date: 1883 the basic monetary unit of Peru before 1985 and since 1990 — see money table  IV. noun  Etymology: -~ (as in hydro~), from ~ution  Date: 1899 a fluid colloidal system; especially one in which the continuous phase is a liquid  V. abbreviation ~uble