a. Obs. rare–0. [f. L. terrisonus, f. stem of terr-ēre to frighten + sonāre to sound; cf. sonānt-em pr. pple.] (See quot.) So † Terrisonous a. Obs. rare–0.
1656. Blount, Glossogr., Terrisonant, that sounds bitterly [ed. 1674 terribly].
1658. Phillips, Terrisonant, sounding terribly.
1721. Bailey, Terrisonous, that soundeth terribly.
