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
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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 […]
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electricity. a cell using an acid electrolyte. . acid cell n. see parietal cell.
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acid deposition acid deposition the acc-mulation of acids or acidic compounds on the surface of the earth, in lakes or streams, or on objects or vegetation near the earth’s surface, as a result of their separation from the atmosphere. acid deposition can harm the environment in a variety of ways, as by causing the acidification […]
- Acid dye
any of a cl-ss of dyes containing one or more acidic groups, as the sulfo group: used in acid solution chiefly for dyeing wool and silk. historical examples if there is a precipitate there is a basic dye, if not, an acid dye. the manufacture of paper robert walter sindall the goods may advantageously be […]
- Acid etching
noun a technique for engraving blown or cast gl-ss or a metal by the use of an acidic substance; esp. the use of hydrofluoric acid to etch a pattern onto a gl-ss or metal surface examples acid etching craft kits are now available, making the process simple and fun. word origin by 1873 historical examples […]