(5) רֹאשׁ and once for distinction sake רוֹשׁ Deut. 32:3 2, is also the name of a poisonous plant, Deu. 29:17; growing quickly and luxuriantly, Hos. 10:4; of a bitter taste, Ps. 69:22; Lam. 3:5; and on this account frequently connected with wormwood, Deu. 29:17; Lament. 3:19; as I judge neither the cicuta as thought by Celsius in Hierob. ii. 46, seqq.; nor colocynth, as thought by Oedmann (iv. p. 63); nor lolium, darnel (Mich. Supplemm. p. 2220); but the poppy, so called from its heads (Liv. i. 54). מֵי רֹאשׁ juice of poppies, opium, Jer. 8:14; 9:14; 23:15. Hence poison of any kind, Deut. 32:32, 33; Job 20:16.
Derivatives, מְרַאֲשׁוֹת, רִישׁוֹן, רֵאשִׁית — רִאשָׁה, and pr.n. מָרֵאשָׁה.