emender

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e·mend

E0108700 (ĭ-mĕnd′)tr.v. e·mend·ed, e·mend·ing, e·mends To improve by critical editing: emend a faulty text.
[Middle English emenden, from Latin ēmendāre : ē-, ex-, ex- + mendum, defect, fault.]
e·mend′er n.

emender

(ɪˈmɛndə) na person who emends