|jēə|läjik, -jēk adjective
or ge·o·log·i·cal -jə̇kəl, -jēk-
Etymology: geology + -ic, -ical
: of, relating to, or based on geology : described or ascertained by geology
geologic strata
a geologic lecture
• ge·o·log·i·cal·ly -jə̇k(ə)lē, -jēk-, -li adverb