Definition of neovolcanic in US English:

neovolcanic

adjective

Geology
  • Of, relating to, or designating volcanic rocks and phenomena dating from the Tertiary period (up to about 65 million years ago) to the present time (contrasted with palaeovolcanic). Now often: specifically designating or relating to zones of recent volcanic activity.

Origin

Late 19th century; earliest use found in American Naturalist. From neo- + volcanic [noun], after German neovulkanisch (H. Rosenbusch Mikroskopische Physiogr. der Massigen Gesteine (ed. 2) II. 6).

Pronunciation

neovolcanic

/ˌniːəʊvɒlˈkanɪk/