רַעַף, pl. רְעָפִים, רְעָפִין (רעף, cmp. רצף, to press, flatten)
רַעַף, flints. Y. Ber. VIII, 12ᵇ bot. זימן לו הקב"ה שני ר׳ וכ׳ the Lord made him (Adam) find two flints which he struck against each other and produced fire; Gen. R. s. 11; s. 12; s. 82. Bets. IV, 7 (33ᵃ) אין מוציאין את האור … ולא מן הר׳ Bab. ed. (absent in Mish. a. Y. ed.) you must not produce fire (on the Holy Day) from wood … or from flints.
רַעַף, glazed tiles. Ib. אין … את הר׳, v. לָבַן II. Men. V, 9 מאפה ר׳ what is baked on hot tiles; Tosef. ib. VII, 20 עשאן … ובר׳ if he baked them in a brazier or on tiles; a. e.