From the same as ceder; a colonnade or internal portico (from its rows of pillars) -- porch.
see HEBREW ceder
H4528. misderon
[מִסְדְּרוֺן] noun [masculine] porch, colonnade ? (place of a row (of pillars) ?); — only with, ה locative: הַמִּסְדְּר֑וֺנָה אֵהוּד וַיֵּצֵא Judges 3:23 precise meaning dubious, compare GFM.
סהר (√ of following = be round?; compare Late Hebrew סַ֫הַר a round place; Assyrian sîru, enclosing wall; also Phoenician סהרו
proper name, of a location).