Word Study
subsistent |
subsister |
subsizar |
subsoil |
subsolary |
subsonic
| subspace
| subspecies
| subsphenoidal
| subspherical
| subspinous
subsonic
WORDNET DICTIONARY
Adjective subsonic has 1 sense
OXFORD DICTIONARY
subsonic, adj. relating to speeds less than that of sound.
Derivative
subsonically adv.
For further exploring for "subsonic" in Webster Dictionary Online