n. 1. 1 any physiologically active internal secretion, especially one of uncertain classification.
Syn. -- autocoid. [ WordNet 1.5 ]

adj. 1. of or pertaining to an autacoid. [ WordNet 1.5 ]

n. [ It. catacomba, fr. L. catacumba perh. from Gr. kata` downward, down + ky`mbh cavity. ] A cave, grotto, or subterraneous place of large extent used for the burial of the dead; -- commonly in the plural. [ 1913 Webster ]

☞ The terms is supposed to have been applied originally to the tombs under the church of St. Sebastian in Rome. The most celebrated catacombs are those near Rome, on the Appian Way, supposed to have been the place or refuge and interment of the early Christians; those of Egypt, extending for a wide distance in the vicinity of Cairo; and those of Paris, in abandoned stone quarries, excavated under a large portion of the city. [ 1913 Webster ]

n. [ Pref. cata + acoustics: cf. F. caraconstique. ] (Physics) That part of acoustics which treats of reflected sounds or echoes See Acoustics. Hutton.

a. [ Glutaric + aconitic. ] (Chem.) Pertaining to, or derived from, an acid intermediate between glutaric and aconitic acids. [ 1913 Webster ]

n. [ From Itacolumi, a mountain of Brazil. ] (Min.) A laminated, granular, siliceous rocks, often occurring in regions where the diamond is found. [ 1913 Webster ]

a. [ From aconitic, by transposition of the letters. ] (Chem.) Pertaining to, or designating, an acid, C5H6O4, which is obtained as a white crystalline substance by decomposing aconitic and other organic acids. [ 1913 Webster ]

n. (Chem.) The unsaturated dicarboxylic acid CH2=C(COOH)CH2.COOH, also called methylenesuccynic acid and propylene dicarboxylic acid. [ PJC ]

n. (Zool.) The three-banded armadillo (Tolypeutis tricinctus). See Illust. under Loricata. [ 1913 Webster ]

a. [ Oto- + acoustic: cf. F. otacoustique. ] Assisting the sense of hearing; as, an otacoustic instrument. [ 1913 Webster ]

{ } n. An instrument to facilitate hearing, as an ear trumpet. [ 1913 Webster ]

n. [ Panta- + Gr. ko`smos universe. ] See Cosmolabe. [ 1913 Webster ]

n. [ Sp. ] See Pataca. [ 1913 Webster ]

a. [ See Penta-, Coccus. ] (Bot.) Composed of five united carpels with one seed in each, as certain fruits. [ 1913 Webster ]

n. (Gr. Antiq.) See Penteconter. [ 1913 Webster ]

a. (Geol.) Designating, or pertaining to, the series of rocks forming the Taconic mountains in Western New England. They were once supposed to be older than the Cambrian, but later proved to belong to the Lower Silurian and Cambrian. [ 1913 Webster ]