solid fuel any of various rocket propellants, combining fuel and oxidizer in a solid storable mass.
solid geometry the branch of geometry dealing with three-dimensional figures and surfaces.
solid rocket any rocket that uses solid fuel.
Solid South formerly, in the United States, the southern states traditionally regarded as solidly supporting the Democratic Party.
soliloquize to speak aloud what is in one's mind when, or as if when, no one is present or listening.
soliloquy an act of talking or a speech by one who is, or is considered to be, alone.
solitary confinement the confinement of a prisoner in complete isolation from others, usu. used as a form of punishment.
soliton in physics, a solitary wave, or a solution to a type of equation that represents such a wave.
solmization the act, process, or system of using syllables to represent the different notes of the musical scale, often as a teaching aid.
soloist a person who performs a solo.
Solo man a type of early human known from fossil skull remains found in Java, esp. near the Solo River.
Solomon according to the Old Testament, the third king of Israel, who reigned in the tenth century B.C., was renowned for his wisdom, and built the first temple in Jerusalem.