a. rare. [f. L. crusta + -AL.] Of or pertaining to a crust; consisting of crust.
1860. Worcester cites N. Brit. Rev.
1892. C. Lapworth, in Proc. Geogr. Soc., 697. The many twisting crustal septa of the earth.
Crustalogical, Crustalogist, Crustalogy, synonyms of CRUSTACEOLOGICAL, etc.
Proposed by Webster (1828), and in later Dicts.
