A moth larva that spins a protective case around itself; (also) any of various small moths having such larvae, especially one of the family Coleophoridae.
Origin
Mid 19th century.
Definition of casebearer in US English:
casebearer
noun
A moth larva that spins a protective case around itself; (also) any of various small moths having such larvae, especially one of the family Coleophoridae.