Geode
['dʒiːəʊd]
Definition
(noun.) (mineralogy) a hollow rock or nodule with the cavity usually lined with crystals.
Checker: Patty--From WordNet
Definition
(n.) A nodule of stone, containing a cavity, lined with crystals or mineral matter.
(n.) The cavity in such a nodule.
Typist: Weldon
Definition
n. (min.) a rounded nodule of stone with a hollow interior.—adj. Geodif′erous bearing or producing geodes.
Checked by Hank