- non_programmed halt
- north eastward
- north eastern
- north eastwards
- ninety column card
- neuroeffecter junction
- nasion_menton height
- nothing of the sort
- nothing of the kind
- negative contrast angiocardiography
- naso_bregmaic arc
- nasal spur
- nuclear free
- natural acquired active immunity
- nonplanar ring
- null_mutation
- natural antagonist
- natural acquired passive immunity
- nasopalatine groove
- nonsecretor
- nonspecific suppurative pneumonia
- notspot
- not take a blind bit of notice
- nephritic kidney
- neogamist
- newlywed
- nitrobacterium
- navigate
- no due
- natural desaster
- not to care two hoots
- not to have even a thatched roof to live under
- nitrate assimilation
- nitric
- non_combatant
- non_selective action
- neurovaccine
- noninhalation anasthetic
- not to have a prayer
- no harm done
- non_ulcerative blepharitis
- needle shield
- non_ulcer dyspepsia
- nasal sill
- nigostriate tract
- net loss
- not one little bit
- not to care a brass farthing
- not a dog's chance
- no fear