protoclastic

adjective
pro·​to·​clas·​tic | \ ¦prōtə¦klastik \

Definition of protoclastic

: of, relating to, or constituting the texture of an igneous rock whose earlier crystals show deformation and granulation produced before the complete solidification of the magma

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History and Etymology for protoclastic

German protoklastisch, from prot- + -klastisch -clastic

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Cite this Entry

“Protoclastic.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/protoclastic. Accessed 21 Oct. 2020.

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