Where does “kaharabu” come from?

kaharabu (Swahili) comes from Omani Arabic كهراب, from Persian کهربا, from Persian کاه, from Persian کاستن, from Proto-Iranian kas-, from Proto-Indo-European kʷeḱ- — to see; to look.

kaharabu (Swahili): amber

Definitions

amber

Ancestry of “kaharabu”, step by step

Step	Language	Word	Meaning
1	Omani Arabic	كهراب	—
2	Persian	کهربا	amber
3	Persian	کاه	chaff; straw; hay
4	Persian	کاستن	to decrease
5	Proto-Iranian	kas-	to be small, diminish, lessen
6	Proto-Indo-European	kʷeḱ-	to see; to look

Every word from Proto-Indo-European kʷeḱ- →Every word from Proto-Iranian kas- →Every word from Persian کاستن →