noun🔗ShareAbbreviation of atomic units."The scientist's calculations used au for the units of length. "physicsunitChat with AIVocabulary GamePractice Reading
noun🔗ShareAbbreviation of absorbance units."The spectrophotometer reading showed the sample had an absorbance of 0.5 AU. "chemistrybiochemistryscienceunitChat with AIVocabulary GamePractice Reading
