a. [ L. ignescens, p. pr. of ignescere to become inflamed, fr. ignis fire: cf. F. ignescent. ] Emitting sparks of fire when struck with steel; scintillating; as, ignescent stones. [ 1913 Webster ]

a. [ L. senescent, p. pr. of senescere to grow old, incho. fr. senere to be old. ] Growing old; decaying with the lapse of time. “The night was senescent.” Poe. “With too senescent air.” Lowell. [ 1913 Webster ]