رقم

أَرْقَمُ ذ (assumed tropical:) A certain serpent: (JK:) a serpent in which are blackness and whiteness: (S, M, K:) or a serpent [ begotten ] between two serpents [app. of different varieties ], marked with redness and blackness and duskiness and [ the colour termed ] بُغْثَة [q. v.]: (ISh:) or a serpent upon which are white specks: (Ham p. 784:) or the most malignant of serpents, and the most wont to pursue mankind: (Ibn-Habeeb, K:) or a serpent like the جَانّ in respect of the fear that men have of killing it, though it is one of the weakest and the least irascible of serpents; for one fears, in killing the ارقم and the جانّ, the punishment of the جِنّ to them who kill them: (Sh:) or, applied to a serpent, i. q. أَرْقَشُ [q. v.] : (Mgh:) or the male serpent: (K:) the female is not so called, nor is she called رَقْمَاآءُ; (TA;) but she is called رَقْشَاآءُ: (K, TA:) when you use the epithet, you say أَرْقَشُ; but أَرْقَمُ is [used as] a subst: (Ibn- Habeeb:) the pl. is أَرَاقِمُ, (JK, ISd,) a pl. proper to substs., because the quality of a subst. is predominant in it. (ISd, TA.) ― -b2- See also مِرْقَمٌ. ― -b3- For the fem., رَقْمَاآءُ, see رَقِمٌ, in two places.