Quasi-solid is the physical term for a semi-solid

Solid

Solid is one of the three classical states of matter . It is characterized by structural rigidity and resistance to changes of shape or volume. Unlike a liquid, a solid object does not flow to take on the shape of its container, nor does it expand to fill the entire volume available to it like a...

. While similar to a solid in some respects (it can support its own weight and hold its shape), a quasi-solid also shares some properties of liquid

Liquid

Liquid is one of the three classical states of matter . Like a gas, a liquid is able to flow and take the shape of a container. Some liquids resist compression, while others can be compressed. Unlike a gas, a liquid does not disperse to fill every space of a container, and maintains a fairly...

s, such as shape conformity to something applying pressure to it, or the ability to flow under pressure. Quasi-solids are also known as amorphous solids because at the microscopic scale they are disordered, unlike traditional crystalline solids.