rock hound

or rockhound

See synonyms for rock hound on Thesaurus.com
nounInformal.
  1. a geologist.

  2. an amateur collector of rocks, fossils, or minerals.

Origin of rock hound

1
An Americanism dating back to 1920–25

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024