achromatous (akromatus)

[ IMG:content-0181.png:[blocks in formation] [ aciculatus , L. acicula : see acicula .] Needle-shaped; acicular; aciculiform. aciculi, n. Plural of aciculus . aciculid (a-sik'ū-lid), n. A gastropod of the family Aciculida . Aciculidæ (as-i-kūʻli-dē), n . pl . [NL., Acicula , q. v.,+- ida .] A family of operculate pulmoniferous mollusks, represented by the European genus Acicula (which see) and the West Indian Geomelania. They have very small turreted shells with few whorls and a thin operculum, the outer lip plain or produced into a tongue, and the eyes on the back of the head.