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Iguanodon :: Iguanodon (n.) A genus of gigantic herbivorous dinosaurs having a birdlike pelvis and large hind legs with three-toed feet capable of supporting the entire body. Its teeth resemble those of the iguana, whence its name. Several species are known, mostly from the Wealden of England and Europe. See Illustration in Appendix..

Boa Constrictor :: Boa constrictor () A large and powerful serpent of tropical America, sometimes twenty or thirty feet long. See Illustration in Appendix..

Trematoid :: Trematoid (a.) Of or pertaining to the Trematodea. See Illustration in Appendix.

Flea :: Flea (n.) An insect belonging to the genus Pulex, of the order Aphaniptera. Fleas are destitute of wings, but have the power of leaping energetically. The bite is poisonous to most persons. The human flea (Pulex irritans), abundant in Europe, is rare in America, where the dog flea (P. canis) takes its place. See Aphaniptera, and Dog flea. See Illustration in Appendix..

Timothy Grass :: Timothy grass () A kind of grass (Phleum pratense) with long cylindrical spikes; -- called also herd's grass, in England, cat's-tail grass, and meadow cat's-tail grass. It is much prized for fodder. See Illustration in Appendix..

Dinoceras :: Dinoceras (n.) A genus of large extinct Eocene mammals from Wyoming; -- called also Uintatherium. See Illustration in Appendix.

Dinosauria :: Dinosauria (n. pl.) An order of extinct mesozoic reptiles, mostly of large size (whence the name). Notwithstanding their size, they present birdlike characters in the skeleton, esp. in the pelvis and hind limbs. Some walked on their three-toed hind feet, thus producing the large bird tracks, so-called, of mesozoic sandstones; others were five-toed and quadrupedal. See Illust. of Compsognathus, also Illustration of Dinosaur in Appendix..

Catboat :: Catboat (n.) A small sailboat, with a single mast placed as far forward as possible, carring a sail extended by a gaff and long boom. See Illustration in Appendix..

Schooner :: Schooner (n.) Originally, a small, sharp-built vessel, with two masts and fore-and-aft rig. Sometimes it carried square topsails on one or both masts and was called a topsail schooner. About 1840, longer vessels with three masts, fore-and-aft rigged, came into use, and since that time vessels with four masts and even with six masts, so rigged, are built. Schooners with more than two masts are designated three-masted schooners, four-masted schooners, etc. See Illustration in Appendix..

Didelphous :: Didelphous (n.) Formerly, any marsupial; but the term is now restricted to an American genus which includes the opossums, of which there are many species. See Opossum. [Written also Didelphis.] See Illustration in Appendix..

Gordiacea :: Gordiacea (n. pl.) A division of nematoid worms, including the hairworms or hair eels (Gordius and Mermis). See Gordius, and Illustration in Appendix..

Lustrum :: Lustrum (n.) A lustration or purification, especially the purification of the whole Roman people, which was made by the censors once in five years. Hence: A period of five years..

Coaita :: Coaita (n.) The native name of certain South American monkeys of the genus Ateles, esp. A. paniscus. The black-faced coaita is Ateles ater. See Illustration in Appendix..

Redia :: Redia (n.) A kind of larva, or nurse, which is prroduced within the sporocyst of certain trematodes by asexual generation. It in turn produces, in the same way, either another generation of rediae, or else cercariae within its own body. Called also proscolex, and nurse. See Illustration in Appendix..

Lingula :: Lingula (n.) Any one of numerous species of brachiopod shells belonging to the genus Lingula, and related genera. See Brachiopoda, and Illustration in Appendix..

Topgallant :: Topgallant (a.) Situated above the topmast and below the royal mast; designatb, or pertaining to, the third spars in order from the deck; as, the topgallant mast, yards, braces, and the like. See Illustration of Ship..

Nectary :: Nectary (n.) That part of a blossom which secretes nectar, usually the base of the corolla or petals; also, the spur of such flowers as the larkspur and columbine, whether nectariferous or not. See the Illustration of Nasturtium..

Dipnoi :: Dipnoi (n. pl.) A group of ganoid fishes, including the living genera Ceratodus and Lepidosiren, which present the closest approximation to the Amphibia. The air bladder acts as a lung, and the nostrils open inside the mouth. See Ceratodus, and Illustration in Appendix..

Yawl-rigged :: Yawl-rigged (a.) Having two masts with fore-and-aft sails, but differing from a schooner in that the after mast is very small, and stepped as far aft as possible. See Illustration in Appendix..

Familiar :: Familiar (a.) Well known; well understood; common; frequent; as, a familiar illustration..

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