Solids

noun

1. A substance in the fundamental state of matter that retains its size and shape without need of a container (as opposed to a liquid or gas).
2. A three-dimensional figure (as opposed to a surface, an area, or a curve).
3. A favor.

   "I owe him; he did me a solid last year."

4. An article of clothing which is of a single color throughout.

   "I prefer solids over paisleys."

5. (in the plural) Food which is not liquid-based.

   "The doctor said I can't eat any solids four hours before the operation."