1. Firm; compact; not fluid; without interstices or cavities; not cancellous.
2. A body that retains its form when not confined; one that is not fluid, neither liquid nor gaseous.
The information shown above for solid is provided by Stedman's.
* Stedman's, part of Lippincott Williams & Wilkins, provide a comprehensive line of health-science publications for healthcare professionals and medical students.