fremescent

from The Collaborative International Dictionary of English v.0.48

Fremescent \Fre*mes"cent\, a. [L. fremere to roar, murmur +
   -escent.]
   Becoming murmurous, roaring. "Fremescent clangor." --Carlyle.
   -- {Fre*mes"cence}, n.
   [Webster 1913 Suppl.]