chalazoidite

noun

chal·​a·​zoid·​ite

ˈkaləˌzȯiˌdīt

plural -s

: a spherical body formed during some volcanic eruptions by concentric accretion of pumiceous dust upon a pellet of mud blown into the air from the volcano

Word History

Etymology

Greek chalaza hailstone + English -oid + -ite

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