- Newtonian liquid
- nialamide
- niccolite
- nicholsonite
- nick break
- nickel arsenide
- nickel silver
- nicol
- nicotelline
- nigre
- nimonic alloy
- niobium
- nipping fork
- nipple
- niter
- niter cake
- nitinol
- nitosyl
- nitrated cellulose
- nitridation
- nitriding steel
- nitrile rubber
- nitro-group
- nitrobenzene
- nitrocopper
- nitrocotton
- nitrogen chain
- nitrogen compound
- nitrogen cycle
- nitrogen gas
- nitrogenated
- nitrogenous
- nitrogenous fertilizer
- nitromethane
- nitronaphthalene
- nitrosation
- nitrosulfuric acid
- nitrotoluene
- nitrous
- nitrous oxide
- nonburning steel
- nonconducting rock
- nonrigid plastic
- nonstaining
- nonwetting fluid
- norbornane
- normal cell
- nodular chalk
- nodular limestone
- nodular ore
- nodular shale
- nodulous limestone
- nominal stress
- non-settling
- non-sugar
- noncoking coal
- nondirectional filaments
- nonoxidizing alloy
- nominal thickness
- non-bedded
- non-conductive
- non-corrodible
- nonadditive oil
- noname
- nonbaking coal
- nondrying oil
- nonlamellar pearlite
- nonmetallic inclusion
- nonoic acid
- nonosilane
- nonrecoverable oil
- nonrefinable
- nonviscous distillate
- norbergite
- nordhausen acid
- normal combustion
- normal dip
- normal downthrow
- normal granite
- normal paraffin
- normal rupture
- normal sonde
- normal water
- normalization factor
- normalizing
- normorphine
- noropianic
- northfieldite
- notch angle
- notch gun
- novalac
- novolac resin
- nuclear binding
- nuclear chemistry
- nuclear fuel
- nuclear test
- nucleate boiling
- nucleic
- nucleophilicity
- nuclide