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1. Good; well; true: euplastic.
2. A derivative of a specified substance: eucaine.
well, pleasant, or good: eupeptic; euphony.
[via Latin from Greek, from eus good]
a combining form meaning “good,” “well,” occurring orig. in loanwords from Greek (Eucharist; eudemon); in scientific coinages, esp. taxonomic names, it often has the sense “true, genuine” (eukaryote).
[< Greek, comb. form of eús good or eú, eû well]