Exuviae

1. n. pl. The fossil shells and other remains which animals have left in the strata of the earth.
2. n. pl. Cast skins, shells, or coverings of animals; any parts of animals which are shed or cast off, as the skins of snakes, the shells of lobsters, etc.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.