Word Study
[2x]
: Pâ Pæ Pè Pé Pœ P- P. P/ P< Pa Pb Pc Pd Pe Pf Ph Pi Pj Pk Pl Pm Pn Po Pp Pr Ps Pt Pu Pv Pw Px Py
periostracum
CIDE DICTIONARY
periostracum, n. [NL., fr. Gr. around + shell of a testacean.].
A chitinous membrane covering the exterior of many shells; -- called also epidermis . [1913 Webster]
For further exploring for "periostracum" in Webster Dictionary Online