Meaning

noun (in India) a unit of length having different values in different localities

noun ratio of the adjacent side to the hypotenuse of a right-angled triangle

noun lettuce with long dark-green leaves in a loosely packed elongated head

originBorrowed from Hindustani کوس / कोस (kos). Doublet of krosa.

Etymology from Wiktionary, CC BY-SA 3.0