1. the concave underside of a jellyfish’s bell-shaped body
Usage: biology

Examples

• The jellyfish’s subumbrella contracted rhythmically to propel it through the water.
• Marine biologists examined the subumbrella to study the creature’s locomotion.
• Tentacles hang from the edges of the subumbrella in most jellyfish species.
• The subumbrella’s muscle contractions create the pulsing motion of the jellyfish.
• Researchers photographed the intricate patterns on the subumbrella’s surface.