theca

Noun
  1. A case or sheath especially a pollen sac or moss capsule (synset 113113481)
    is a type of: cover, covering, natural covering - a natural object that covers or envelops
    same as: sac
  2. Outer sheath of the pupa of certain insects (synset 101907962)
    is a type of: case, sheath - an enveloping structure or covering enclosing an animal or plant organ or part

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