1. the remains or traces of ancient plants or animals preserved in rock or other geological formations
2. people or things that are outdated or resistant to change
Usage: informal; often derogatory

Examples

• The museum displayed fossils of dinosaurs that lived millions of years ago.
• Scientists study fossils to learn about ancient life forms.
• We found several small fossils embedded in the limestone.
• The trilobite fossils were remarkably well-preserved.
• Some politicians are just old fossils who refuse to embrace new ideas.
• Don’t be such a fossil – try using the new technology!