Related Content
- Daily Word Quiz: philately
- Analogy of the Day: Today’s Analogy
- Spelling Bee: Today’s Spelling Bee
- Frequently Misspelled Words
- Frequently Mispronounced Words
- Easily Confused Words
- Writing & Language
periostracum: Meaning and Definition of
per•i•os•tra•cum
Pronunciation: (per"ē-os'tru-kum), [key]
— pl. -ca
- the external, chitinlike covering of the shell of certain mollusks that protects the limy portion from acids.
