1. Of animals or plants that have a hard shell

See also: shelled

• nitrogen narcosis
• nitrogen oxide
• nitrogen trichloride
• nitrogen-bearing
• nitrogen-fixing
• nitrogenase
• nitrogenise
• nitrogenize
• nitrogenous
• nitroglycerin
• nitroglycerine
• nitrohydrochloric acid
• nitrosobacteria
• Nitrosomonas
• Nitrospan
• Nitrostat
• nitrous
• nitrous acid
• nitrous bacteria
• nitrous bacterium
• nitrous oxide
• nitta tree
• nitty
• nitty-gritty
• nitweed