WAVELLITE, noun A mineral, a phosphate or sub-phosphate of alumin; commonly found in crystals, which usually adhere and radiate, forming hemispherical or globular concretions, from a very small size to an inch in diameter. The form of the crystal is usually that of a rhombic prism with dihedral terminations.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI