1. A pitcher-shaped or tubular leaf or leaf modification found in certain carnivorous plants, used to trap and digest insects.
Usage: botany; plural: ascidia
2. In zoology, a sac-like structure or body cavity in certain marine animals, particularly tunicates.
Usage: zoology; technical

Examples

• The ascidium of the pitcher plant is lined with slippery walls that cause insects to slide into the digestive fluid below.
• Carnivorous plants use their ascidia to supplement nutrients from poor soil.
• The ascidium develops from a modified leaf blade and petiole in some plant species.
• Insects attracted to the ascidium's sweet nectar become trapped inside the tubular structure.
• The ascidium is an adaptation that allows plants to thrive in nutrient-poor environments.