samum Save DMLBS 1 samum, (bot.) kind of plant, perh. pennyroyal (Mentha pulegium) or wild thyme (Thymus serpyllum). Cf. Plant Names 192, 215–16. samum [? l. origanum], hylwurt Ælf. Gl. 134. 2 †samum, f. l. †samum [? l. ramum], i. frutex juniperi Alph. 159.