1. Having a smooth shell

See also: shelled

• nuclear winter
• nuclear-powered ship
• nuclear-powered submarine
• nuclease
• nucleate
• nucleated
• nucleation
• nucleic acid
• nucleolar
• nucleolar organiser
• nucleolar organizer
• nucleole
• nucleolus
• nucleolus organiser
• nucleolus organizer
• nucleon
• nucleon number
• nucleonics
• nucleoplasm
• nucleoprotein
• nucleoside
• nucleoside reverse transcriptase inhibitor
• nucleosynthesis
• nucleotide
• nucleus