o·o·the·ca 
(ō′ə-thēkə)
(ō′ə-thēkə)n. pl. o·o·the·cae (-sē)
The usually hardened egg case of certain invertebrates, such as a cockroach.
o′o·thecal adj.
- natural hat trick
- natural history
- naturalism
- naturalist
- naturalistic
- naturalistically
- naturalizable
- naturalization
- naturalize
- natural killer cell
- natural language
- natural law
- natural logarithm
- naturally
- naturalness
- natural number
- natural philosopher
- natural philosophy
- natural resource
- natural rubber latex
- natural science
- natural scientist
- natural selection
- natural theology
- natural virtue