1. a person with old-fashioned or conservative ideas
Usage: informal
2. a large, old fish or turtle with algae or moss growing on its back

Examples

• The old mossback refused to use email and insisted on writing letters.
• My grandfather is such a mossback when it comes to technology.
• The political mossbacks opposed any changes to the traditional system.
• The fisherman caught a huge mossback bass that had been living in the lake for decades.
• The ancient turtle was a real mossback, covered in green algae.
• Don’t be such a mossback about trying new restaurants.