1. resembling or relating to seaweed, especially brown algae
Usage: botanical

1. a fossil impression or trace resembling seaweed
Usage: geological

Examples

• The fucoid markings on the rock suggested ancient marine life.
• Scientists studied the fucoid patterns in the sedimentary layers.
• The fucoid appearance of the specimen indicated it was likely algae.
• Geologists found several fucoid impressions in the limestone.
• The fucoid structures were well-preserved in the fossil record.
• Marine biologists noted the fucoid characteristics of the brown algae.