theca

English Thesaurus

1. outer sheath of the pupa of certain insects (noun.animal)

hypernym	:	case, sheath,
definition	:	an enveloping structure or covering enclosing an animal or plant organ or part (noun.body)

2. a case or sheath especially a pollen sac or moss capsule (noun.plant)

hypernym	:	cover, covering, natural covering,
definition	:	a natural object that covers or envelops (noun.object)