אֶרֶס, (√רס; v. רְסַס; as to modification of meaning cmp. Lat. virus) prop. drop, fluid. esp. poison. Y. Ter. III, beg. 42ᵃ the serpent הטיל בו א׳ threw a drop (of poison) into it. Sabb. 62ᵇ (play on t’akkasnah, Is. III, 16) כארס בכעוס (read כא׳ עכיס; v. Var. Rabb. D. S. a. l. note) like the serpent’s poison; a. fr.—Y. Maasr. V, end, 52ᵃ an onion שאין לו אירם (read אירס) which has no penetrating moisture.—Pl. אֵרְסִין, אֵירְסִין. Y. Ter. VIII, 45ᵉᵈ. Cmp. רִיס.