Also found in: Medical, Wikipedia.


adj. Biology
1. Having a spine or spines.
2. Terminating in a spine.

[Late Latin spīnēscēns, spīnēscent-, present participle of spīnēscere, to become thorny, from Latin spīna, thorn.]

spi·nes′cence n.


1. (Biology) having or resembling a spine or spines
2. (Biology) becoming spiny
[C18: from Late Latin spīnēscere to become thorny, from Latin spīna a thorn]
spiˈnescence n
References in periodicals archive ?
Bursera exequielii seems to be the only species of Bursera or "torote" in this zone where it grows with spinescent shrubs such as Ebenopsis confinis (Stand.
Leaves subulate, stiff, sessile, with spines, entire or with 1-5 spinescent lobes on both sides in basal half.
Fruits of Astrophytum are not fleshy, they are almost dry, and they are covered with dense areolar wool and spinescent bracteoles (Anderson, 2001; Powell et al.
Legs: Modified, rather longer and slimmer than is usual for this family; fine setulae scattered on all pairs of legs; in addition longer setae present on fore femur, but these are not as long as is usual in this family; setulae on dorsal aspect of tarsomeres of all legs distinctly longer; basitarsus of middle leg, ventrally with 3 irregular rows of spinescent setae, most of which are longer than diameter of basitarsus; hind femur with a row of fine setae on anteroventral and posteroventral aspect; hind tibia with 2 parallel rows of ventral setae in apical 2/3; mid tibial apicoventral seta absent; claws black and pulvilli normal; hind trochanter normal.
50-50% of total leaf), glabrous, spinescent for 90-100% of length.
apex softly acuminate; not spinescent, midrib raised above, flat below.
spinosa Ruschioideae), a multistemmed, spinescent shrub, and (3) Galenia fruticosa (Aizoaceae) a nonsucculent shrub.
The cactus wren (Campylorhynchus brunneicapillus) nests in a variety of spinescent trees and shrubs, e.
strongly asymmetrical with a well developed lateral wing equaling to exceeding the distal portion of the midnerve, with mucronulate to spinescent apex) and usually ecarinate (vs.
However, it differs in the much simplified hypopygial structures, absent sa and katepisternal setae, markedly different shaped head, well-developed proboscis and in the wing having the costal vein with spinescent setulae and a thickened hu crossvein.