Quasi-solid

{{Short description|Matter apparently intermediate between solids and liquids}}

{{More references|date=December 2009}}

Quasi-solid, false-solid, or partial-solid are terms for a substance which is not clearly a solid or a liquid. While similar to solids in some respects, such as having the ability to support their own weight and hold their shapes, a quasi-solid also shares some properties of liquids, such as conforming in shape to something applying pressure to it and the ability to flow under pressure.{{cn|date=March 2022}} The words quasi-solid, partial-solid, and partial-liquid are used interchangeably. The term "semi-solid" is sometimes used interchangeably with these terms but is not a correct term, as "semi" means two equal halves.{{Citation needed|date=May 2025}}

Quasi-solids and partial-solids are sometimes described as amorphous because at the microscopic scale they have a disordered structure unlike crystalline solids.{{Citation needed|date=May 2025}} They should not be confused with amorphous solids as they are not solids and exhibit properties such as flow which solids do not.{{Citation needed|date=May 2025}}