natural
natural-air
n-bit
n-butyl
n-channel
n-character
n-column
n-dB
n-decyl
n-degree
  n-digit
n-dimensional
N-dimethyl
N-dimethylaniline
N-dimethylformamide
N'-diphenyl-para-phenylene-diamine
N-DOF
n-edged
n-equation
n-faced
n-fold