Abomination is an English term used to translate the Biblical term תֹּועֵבָה tōʻēḇā or to'ba (noun) or ta'ab (verb).
This permission could not be accepted, because Moses said they would have to sacrifice "the abomination of the Egyptians" (Exodus 8:26); i.e., the cow or ox, which all the Egyptians held as sacred, and which they regarded it as sacrilegious to kill.
The word "abomination" is also used in Jewish (and Christian Old Testament) scriptures to refer to homosexual activity (Leviticus 18:22), Leviticus 20:13), idolatry (Deuteronomy 7:25, Deuteronomy 13), cross-dressing (Deuteronomy 22:5), cheating in the market by using rigged weights (Deuteronomy 25:13-19, Proverbs 11:1), and dishonesty (Proverbs 12:22).