solid matter; solid object; solid food
Refers to any solid substance or object, often contrasted with liquids or gases. In medical or dietary contexts, it can specifically mean solid food.
There is solid matter mixed into this liquid.
For a while after the surgery, I couldn't eat solid food.
Compound of 固形 (solid shape) + 物 (thing). The exact historical derivation is uncertain, but the word is a straightforward Sino-Japanese compound.