adj. Of or pertaining to isobutyric acid or its derivatives
The Century Dictionary and Cyclopedia
Noting an acid, a colorless compound, (CH3)2CHCOOH, found in Geratonia Siliqua and, combined with alcohol, in croton-oil.
Word Usage
"The flavor of manufactured bread can sometimes be marked by such unpleasant aroma compounds as sour, sweat-like isovaleric and isobutyric acids, which are produced by flour and yeast enzymes in unbalanced amounts during intensive mixing and high-temperature proofing."