sol

(noun) a colloid that has a continuous liquid phase in which a solid is suspended in a liquid. Synonyms: colloidal solution, colloidal suspension.

(noun) (Roman mythology) ancient Roman god; personification of the sun; counterpart of Greek Helios. Synonyms: Sol.

(noun) the syllable naming the fifth (dominant) note of any musical scale in solmization. Synonyms: soh, so.