Spelling Bee Hive found 1 result for periostracum. This page contains the same results as searching for that word in the app.
periostracum - noun; Level 8; origin: Greek; pronunciation: ˌperēˈästrəkəm. a chitinous outer layer covering the shell of many mollusks and protecting it from corrosion.
periostracum is in Level 8, Set 20 of the Spelling Bee Hive practice sets.
Where periostracum appears: 1 competition on record.
Scripps National Spelling Bee: asked 1 time in 2007 - Round 4 (2007).
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