sol

noun

1. 1.The fifth step in the solfège scale of C (Ut), preceded by fa and followed by la.
2. 2.A solar day on Mars (equivalent to 24 hours, 39 minutes, 35 seconds).
3. 3.A Spanish-American gold or silver coin, now the main currency unit of Peru (also new sol), or a coin of this value.
4. 4.A type of colloid in which a solid is dispersed in a liquid.
5. 5.A solution to an objection (or "ob"), in old books of controversial divinity.