noun
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.
この液体の中に固形物が混ざっている。
There is solid matter mixed into this liquid.
手術後しばらくは固形物を食べられなかった。
For a while after the surgery, I couldn't eat solid food.
液体 means liquid, often contrasted with 固形物 in everyday contexts.
Compound of 固形 (solid shape) + 物 (thing). The exact historical derivation is uncertain, but the word is a straightforward Sino-Japanese compound.