Diphyllous \Diph"yl*lous\ (d[i^]f"[i^]l*l[u^]s or d[-i]*f[i^]l"-), a. [Gr. di- = di`s- twice + fy`llon leaf: cf. F. diphylle.] (Bot.) Having two leaves, as a calyx, etc. [1913 Webster]