I. | ̷ ̷ ̷ ̷ at hydro- +|jenik adjective
Etymology: hydr- + -genic
1. : formed by the agency of water
dinosaur footprints in hydrogenic rock
2. : developed under the dominant influence of water (as in a cold humid region)
hydrogenic soil
II. adjective
Etymology: International Scientific Vocabulary hydrogen + -ic
: resembling hydrogen in nuclear composition