Geers's law is a phonological rule for Akkadian language according to which two different emphatic consonants (ṭ, ṣ, ḳ) cannot occur in one Akkadian word.
[1] The law usually pertains to inherited Proto-Semitic roots whose emphatics were usually dissimilated.
It also affected loanwords, such as Amorite *qṭl > Akkadian ḳtl.
In rare cases it did not apply, such as ḳaṣû instead of kaṣû.
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