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The term melferite is proposed in Daczko and Piazolo 2022 (Lithos). It is from the Greek meldein, “melt”, and Latin fer, “that which carries”, for rocks produced in high-strain melt-migration pathways though sub-solidus rocks. These rocks are currently conflated with genuine mylonite. Careful assessment and distinguishing mylonite from melferite is crucial as (1) rocks deformed in the presence of melt, even small percentages of melt, are orders of magnitude weaker than their solid-state equivalents, (2) melt-rock interaction in such zones may result in metasomatism, and (3) such zones may sustain long-lived melt migration and ascent enabling chemical differentiation at a crustal scale.