1. a type of brown seaweed that grows on rocks in coastal areas, especially in tidal zones
Usage: marine biology

Examples

• The tide pools were covered with slippery rockweed.
• Marine biologists studied the rockweed growing on the jetty.
• Rockweed provides important habitat for small marine creatures.
• The rocky shore was thick with brown rockweed after the storm.
• Children carefully stepped over the rockweed while exploring the tide pools.
• Rockweed can survive being exposed to air during low tide.