dehydroacetic acid
noun
de·hy·dro·ace·tic acid
| \ (ˌ)dē-ˌhī-drō-ə-ˌsēt-ik-
\
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Medical Definition of dehydroacetic acid
: a crystalline acid C8H8O4 related to pyrone and used as a fungicide, bactericide, and plasticizer