Acanthopterygii :: Acanthopterygii (n. pl.) An order of fishes having some of the rays of the dorsal, ventral, and anal fins unarticulated and spinelike, as the perch..
Acanthopterygious :: Acanthopterygious (a.) Having fins in which the rays are hard and spinelike; spiny-finned.
Acanthus :: Acanthus (n.) A genus of herbaceous prickly plants, found in the south of Europe, Asia Minor, and India; bear's-breech..
Acanthus :: Acanthus (n.) An ornament resembling the foliage or leaves of the acanthus (Acanthus spinosus); -- used in the capitals of the Corinthian and Composite orders.
Almacantar :: Almacantar (n.) A recently invented instrument for observing the heavenly bodies as they cross a given almacantar circle. See Almucantar.
Almucantar :: Almucantar (n.) A small circle of the sphere parallel to the horizon; a circle or parallel of altitude. Two stars which have the same almucantar have the same altitude. See Almacantar.