Proto-Baltic: *seĩk-a-, *saĩk-a-, *sī̃k-a- c., *seîk-s-n-ia- c.
Meaning: vessel, basket
Lithuanian: sī̃ka-s `Mass'; saĩka-s `Hohlmass', síeka-s`(Hohl)mass, Metze (= 6 Garnetz); Saatkorb'; siéksni-s `Faden, Klafter, Spannweite der gestreckten Arme'
Lettish: sìeks `Külmit (Getreidemass -- dial. 1/3 Lof, 1/4 Lof, 1/6 Lof)'