- the remains of the female sex organ, or archegonium, of a moss, forming the protective caplike covering of the spore case
- any similar protective hood, cap, or covering of a fruit, flower, or root
Origin of calyptraModern Latin from Classical Greek kalyptra, covering for the head, veil from kalyptein, to conceal, cover: for Indo-European base see conceal
- The protective cap or hood covering the spore case of a moss or related plant.
- A similar hoodlike or caplike structure, such as a root cap.
Origin of calyptraMedieval Latin from Greek kaluptra veil from kaluptein to cover ; see kel-1 in Indo-European roots.