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acicular (adj.)

"resembling or in the form of small needles," 1794, from Latin acicula "needle, small pin," diminutive of acus "pin" (from PIE root *ak- "be sharp, rise (out) to a point, pierce").

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Definitions of acicular from WordNet

acicular (adj.)
narrow and long and pointed; as pine leaves;
Synonyms: acerate / acerose / needle-shaped
From wordnet.princeton.edu