Jastrow: דְּיָקִינְתִּין

דְּיָקִינְתִּין, דְּיָיקִ׳ m. pl. (ὑάκινθος; די for הי or יי to avoid the use of letters of the Tetragrammaton; Ar. reads ייקינטין) hyacinth, a precious stone. Ex. R. s. 38, end לוי ד׳ (not דייקני׳) Levi was represented on the Highpriests’ breast-plate by a hyacinth (h. ברקת). Y’lamd. to Deut. X, 1, quot. in Ar. המרגליות ויי׳ (Yalk. ib. 854 דייקוסנין, דייקינטין, corr. acc.) the pearls and hyacinths. Gen. R. s. 79, end (after interpreting ק̇ש̇ט̇ in ק̇ש̇י̇ט̇ה̇, Gen. XXXIII, 19) what function have Yod Hé here? [read:] אלו חליות ד׳ וזמרגדין שדרכן וכ׳ (v. ‘Rashi’ a. l. a. Yalk. ib. 134) these are the links of hyacinths and smaragds with which jewelry is decorated, i.e. the vowel letters connecting the consonants, but which also have an allegorical meaning (v. the sentence following: מי כותב וכ׳).