Na kasa samun ma'anar ƙamus na kalmar "os lunatum." Duk da haka, "os lunatum" kalma ce ta Latin da ke fassara zuwa "ƙashin lunate" a Turanci. Kashi na lunate kashi ne mai siffar jinjirin wata a wuyan hannun ɗan adam wanda ke bayyana wasu ƙasusuwa da yawa kuma yana taka muhimmiyar rawa wajen motsi da kwanciyar hankali.
