n.
Pronunciation: ' sfir-y ə - ˌ l ī t, ' sfer-, - ə - ˌ l ī t
Function: noun
Date: 1823
: a usually spherical crystalline body of radiating crystal fibers often found in vitreous volcanic rocks
– spher · u · lit · ic \ ˌ sfir-y ə - ' li-tik, ˌ sfer-, - ə - ˌ li- \ adjective