Definitions of eruptive:
- adjective: igneous rock produced by eruption and solidified on or near the earth's surface; rhyolite or andesite or basalt
- adjective: erupting or tending to erupt
Example: "A geyser is an intermittently eruptive hot spring"
- adjective: of igneous rock that has solidified beneath the earth's surface; granite or diorite or gabbro
Search for eruptive at other dictionaries: OneLook, Oxford, American Heritage, Merriam-Webster, Wikipedia