Apparently from an unused root meaning to perforate, i.e. Hollow out; a pan -- pan.
H4958. masreth
מַשְׂרֵת noun masculine apparently = pan, dish, Palestinian Aramaic מסרית, only הַמּ ׳וַתִּקּח 2 Samuel 13:9 and she took the pan; perhaps = ֗֗֗ מַשְׂאֶרֶת, originally dough-pan (שׂאר), kneading-trough, GeiUrschr.382f We (not Dr); > Klo Bu Ry in DiExodus 12:34 (3te Aufl.) (אֶתֿ) הַמְּשָׁרֵת וִתִּקְרָא and she called the servant (HPS del. v.)