The Collaborative International Dictionary
Horrisonous
Horrisonous \Hor*ris"o*nous\, a. [L. horrisonus; horrere to be
horrible + sonus a sound.]
Sounding dreadfully; uttering a terrible sound. [Obs.]
--Bailey.
Wiktionary
horrisonous
a. (context obsolete English) Sounding dreadfully; uttering a terrible sound.