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acicula

[uh-sik-yuh-luh] /əˈsɪk yə lə/
noun, plural aciculae
[uh-sik-yuh-lee] /əˈsɪk yəˌli/ (Show IPA)
1.
a needlelike part; spine, bristle, or needlelike crystal.
2.
a plural of aciculum.
Origin
1875-1880
1875-80; < Neo-Latin, Late Latin, alteration of acucula ornamental pin, equivalent to Latin acu-, stem of acus needle (cf. acute) + -cula -cule1

aciculum

[uh-sik-yuh-luh m] /əˈsɪk yə ləm/
noun, plural aciculums, acicula
[uh-sik-yuh-luh] /əˈsɪk yə lə/ (Show IPA)
1.
an acicula.
2.
Zoology. one of the slender, sharp stylets embedded in the parapodia of certain annelid worms, as the polychaetes.
Origin
alteration of acicula
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for acicula

acicula

/əˈsɪkjʊlə/
noun (pl) -lae (-ˌliː)
1.
a needle-shaped part, such as a spine, prickle, or crystal
Derived Forms
acicular, adjective
Word Origin
C19: New Latin, diminutive of acus needle

aciculum

/əˈsɪkjʊləm/
noun (pl) -lums, -la (-lə)
1.
a needle-like bristle that provides internal support for the appendages (chaetae) of some polychaete worms
Word Origin
C19: New Latin; see acicula
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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