thorn

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Thorn

(thorn),
George W., 20th-century U.S. physician. See: Thorn test, Thorn syndrome.

thorn

(thōrn),
In anatomy, a thornlike or spinous structure.

thorn

a sharply pointed woody plant structure formed from a modified branch.
References in periodicals archive ?
bringo and B.ferraria--by the shape of the cymbial spinules, which are porrect, thornlike, and cover most of the dorsal surface of the cymbium (Figs.
Two small dorsal fins without spines located far back, behind the pelvic fin; anal fin absent; pectoral fins are short and angular; caudal fin without subterminal notch; body cylindrical and head moderately flattened; 5 pairs of gill slits; teeth compressed and bladelike; body covered by irregularly scattered thornlike denticles, varying from small to large, some fused in groups and may form large plates; body colour was brown above and paler below with red blotches.
This gerrid subfamily is diagnosed by a unique combination of characters, although all of them are either homoplasies, such as thornlike microstructures on the cuticulum (also found in Veliidae) and well-developed bucculae (also found in Hebridae, Hydrometridae and Macroveliidae) or reversals, such as the well-developed female ovipositor, the presence of second gonocoxae, the sclerotization of second gonapophyses, the absence of glandular areas of the female gynatrial sac, and the absence of a fecundation pump of the female gynatrial complex (Damgaard, 2008b).