Oothecae is defined as a protective case or capsule containing eggs, primarily of insects such as cockroaches and mantises. There are various synonyms that can be used to describe Oothecae, such as an egg sac or a pod. The term cocoon may also be used, but it is primarily associated with the protective covering of a moth or butterfly pupa. Another synonym that is commonly used is the egg case, which accurately describes the nature of Oothecae. As Oothecae primarily contain insect eggs, they may also be referred to as insect egg cases. In scientific terminology, Oothecae are often referred to as oviposition or ovipositor.