Word Origin & History
"red resinous substance," 1553, from Pers. lak, from Hindi lakh (Prakrit lakkha), from Skt. laksha, which according to Klein is lit. "one hundred thousand," in ref. to the insects that gather in great numbers on the trees and make the resin run out. But others say lakh is an alteration of Skt. rakh,
from an IE root word for "color" [Webster]. Still another guess is that Skt. laksha is related to Eng. lax, lox "salmon," and the substance was perhaps originally so called from being somewhat the color of salmon.