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cone-in-cone (not comparable)

  1. (geology) Consisting of a series of parallel cones, each made up of many concentric cones closely packed together; said of a kind of structure sometimes observed in sedimentary rocks.

Part or all of this entry has been imported from the 1913 edition of Webster’s Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.
(See the entry for cone-in-cone in
Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.)