Etymology
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spiny (adj.)

1580s, from spine + -y (2). Related: Spininess.

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Definitions of spiny

spiny (adj.)
having or covered with protective barbs or quills or spines or thorns or setae etc.;
Synonyms: barbellate / briary / briery / bristled / bristly / burred / burry / prickly / setose / setaceous / thorny
spiny (adj.)
having spines;
Synonyms: spinous
From wordnet.princeton.edu