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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..

Nematoid :: Nematoid (n.) One of the Nematoidea. see Illustration in Appendix.

Lugger :: Lugger (n.) A small vessel having two or three masts, and a running bowsprit, and carrying lugsails. 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..

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

Ascidioidea :: Ascidioidea (n. pl.) A group of Tunicata, often shaped like a two-necked bottle. The group includes, social, and compound species. The gill is a netlike structure within the oral aperture. The integument is usually leathery in texture. See Illustration in Appendix..

Comet :: Comet (n.) A member of the solar system which usually moves in an elongated orbit, approaching very near to the sun in its perihelion, and receding to a very great distance from it at its aphelion. A comet commonly consists of three parts: the nucleus, the envelope, or coma, and the tail; but one or more of these parts is frequently wanting. See Illustration in Appendix..

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

Illumination :: Illumination (n.) Adornment of books and manuscripts with colored illustrations. See Illuminate, v. t., 3..

Vortex :: Vortex (n.) Any one of numerous species of small Turbellaria belonging to Vortex and allied genera. See Illustration in Appendix.

Cheirotherium :: Cheirotherium (n.) A genus of extinct animals, so named from fossil footprints rudely resembling impressions of the human hand, and believed to have been made by labyrinthodont reptiles. See Illustration in Appendix..

Paxillus :: Paxillus (n.) One of a peculiar kind of spines covering the surface of certain starfishes. They are pillarlike, with a flattened summit which is covered with minute spinules or granules. See Illustration in Appendix..

Branchiostegal :: Branchiostegal (n.) A branchiostegal ray. See Illustration of Branchial arches in Appendix.

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..

Ceratosaurus :: Ceratosaurus (n.) A carnivorous American Jurassic dinosaur allied to the European Megalosaurus. The animal was nearly twenty feet in length, and the skull bears a bony horn core on the united nasal bones. See Illustration in Appendix..

Gapeworm :: Gapeworm (n.) The parasitic worm that causes the gapes in birds. See Illustration in Appendix.

Letterpress :: Letterpress (n.) Print; letters and words impressed on paper or other material by types; -- often used of the reading matter in distinction from the illustrations.

Lernaeacea :: Lernaeacea (n. pl.) A suborder of copepod Crustacea, including a large number of remarkable forms, mostly parasitic on fishes. The young, however, are active and swim freely. See Illustration in Appendix..

Compare :: Compare (n.) Illustration by comparison; simile.

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