The Collaborative International Dictionary
Altisonant
Altisonant \Al*tis"o*nant\ ([a^]l*t[i^]s"[-o]*nant), a. [L.
altus high + sonans, p. pr. of sonare to sound.]
High-sounding; lofty or pompous.
--Skelton.
Wiktionary
altisonant
a. High-sounding; lofty or pompous.