The Collaborative International Dictionary
Spinescent
Spinescent \Spi*nes"cent\, a.[L. spinescens, -entis, p. pr. of
spinescere to know to grow thorny, fr. spina a thorn: cf. F.
spinescent.] (Bot.)
Becoming hard and thorny; tapering gradually to a rigid,
leafless point; armed with spines.
--Gray.
Wiktionary
spinescent
a. 1 Having a spine or spines. 2 Terminating in a spine.