Acicula
a needlelike part; spine, bristle, or needlelike crystal.
a plural of .
an .
Zoology. one of the slender, sharp stylets embedded in the parapodia of certain annelid worms, as the polychaetes.
Historical Examples
The banks of Aripo are not the only localities, nor is the acicula the only mollusc, by which pearls are furnished.
Sketches of the Natural History of Ceylon J. Emerson Tennent
acicula lineata is a very small shell, the size of the Pupæ; mainly northern in distribution.
Our British Snails John William Horsley
noun (pl) -lae (-ˌliː)
a needle-shaped part, such as a spine, prickle, or crystal
noun (pl) -lums, -la (-lə)
a needle-like bristle that provides internal support for the appendages (chaetae) of some polychaete worms
Read Also:
- Acicular
shaped like a needle. Metallurgy. (of cast iron) containing ferrite in a needlelike form. (of an alloy) having a microstructure of needlelike components. Historical Examples Hyoscyamine crystallizes in the acicular form, with greater difficulty even than atropine, it also forms less compact crystals. Scientific American Supplement, No. 324, March 18, 1882 Various By repeated solutions […]
- Aciculate
having . marked as with needle scratches. needle-shaped; acicular. Historical Examples aciculate: a surface that appears as if scratched with a needle. Explanation of Terms Used in Entomology John. B. Smith adjective having aciculae marked with or as if with needle scratches
- Aciculum
an . Zoology. one of the slender, sharp stylets embedded in the parapodia of certain annelid worms, as the polychaetes. noun (pl) -lums, -la (-lə) a needle-like bristle that provides internal support for the appendages (chaetae) of some polychaete worms
- Acid anhydride
See under (def 1). a compound formed by removing water from a more complex compound: an oxide of a nonmetal (acid anhydride) or a metal (basic anhydride) that forms an acid or a base, respectively, when united with water. a compound from which water has been abstracted. Historical Examples Like most of the oxides of […]
- Acid
Chemistry. a compound usually having a sour taste and capable of neutralizing alkalis and reddening blue litmus paper, containing hydrogen that can be replaced by a metal or an electropositive group to form a salt, or containing an atom that can accept a pair of electrons from a base. Acids are proton donors that yield […]