Jastrow: דְּיוֹמַד

דְּיוֹמַד m. (perh. a perversion of δίδυμος, forked, cmp. LXX, Josh. VIII, 29; popular etymol. = דְּיוֹ עַמּוּדִין, v. דְּיוֹ II; Erub. 18ᵃ) a corner-piece made of two boards rectangularly joined or of a block dug out in the shape of a trough, four of which corner-pieces form, in legal fiction, an enclosure of wells &c. (v. פַּס), making the ground so enclosed a private place for Sabbath use. Erub. 15ᵃ, a. fr. נידון משום ד׳ is considered as a diomad (two fictitious walls). Y. ib. II, 20ᵃ top, opp. פשוט a plain bar; a. fr.—Pl. דְּיוֹמְדִין. Ib. II, 1 ארבע ד׳ נראין כשמונה four corner pieces having the appearance of eight bars; a. fr. [דיומדין, Y. Shebi. VII, beg. 37ᵇ, v. דִּימוֹרוֹן.]