The term 'neither solid nor liquid' refers to a state of matter known as GAS. GAS is composed of particles that are spread out and move freely, unlike the particles in solids which are tightly packed together and do not move. Gases can be compressed into a smaller volume and expand to fill any container. The most common example of a GAS is air. The crossword solutions for this term are GAS (3 letters) and GASEOUS (7 letters). GASEOUS is an adjective used to describe something that is in a GASEOUS state.