Crossword clue: of or pertaining to geognosy, or to a knowledge of the structure of the earth; geological.

The most common answer is geognostic (10 letters).

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

Possible answers

geognostic 10 letters web-def

Of or pertaining to geognosy, or to a knowledge of the structure of the earth; geological. [R.]

geognostical 12 letters web-def

Of or pertaining to geognosy, or to a knowledge of the structure of the earth; geological. [R.]

pertaining to geological structure 50% similar → geomorphological