Having been formed into or marked with needle-like ridges, striae, or pointed structures.
From aciculate + '-ed' (past participle suffix). The past participle form suggesting that something has undergone the process of becoming needle-like or having needle-like marks applied to it.
While 'aciculate' just means needle-shaped, 'aciculated' suggests something was carved, etched, or naturally formed with those needle marks—like a shell that has fine scratched lines all over it from growth rings.
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