Definition of cinder
i. A loose volcanic fragment that may range from 4 to 32 mm in diameter. Such fragments are usually glassy or vesicular.
Ref: Stokes
ii. A small (1- to 4-cm), commonly vesicular, fragment of lava projected from an erupting volcano; coarser than volcanic ash but smaller than a volcanic bomb.
iii. A juvenile vitric pyroclastic fragment that falls to the ground in an essentially solid condition.
iv. Slag, particularly from an iron blast furnace.
v. A scale thrown off in forging metal.
Compare with: lapilli
Ref: Stokes
ii. A small (1- to 4-cm), commonly vesicular, fragment of lava projected from an erupting volcano; coarser than volcanic ash but smaller than a volcanic bomb.
iii. A juvenile vitric pyroclastic fragment that falls to the ground in an essentially solid condition.
iv. Slag, particularly from an iron blast furnace.
v. A scale thrown off in forging metal.
Compare with: lapilli