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Aporosa :: Aporosa (n. pl.) A group of corals in which the coral is not porous; -- opposed to Perforata.

Parabola :: Parabola (n.) One of a group of curves defined by the equation y = axn where n is a positive whole number or a positive fraction. For the cubical parabola n = 3; for the semicubical parabola n = /. See under Cubical, and Semicubical. The parabolas have infinite branches, but no rectilineal asymptotes..

Neuroptera :: Neuroptera (n. pl.) An order of hexapod insects having two pairs of large, membranous, net-veined wings. The mouth organs are adapted for chewing. They feed upon other insects, and undergo a complete metamorphosis. The ant-lion, hellgamite, and lacewing fly are examples. Formerly, the name was given to a much more extensive group, including the true Neuroptera and the Pseudoneuroptera..

Kephalin :: Kephalin (n.) One of a group of nitrogenous phosphorized principles, supposed by Thudichum to exist in brain tissue..

Flying Squirrel :: Flying squirrel () One of a group of squirrels, of the genera Pteromus and Sciuropterus, having parachute-like folds of skin extending from the fore to the hind legs, which enable them to make very long leaps..

Nitrosyl :: Nitrosyl (n.) the radical NO, called also the nitroso group. The term is sometimes loosely used to designate certain nitro compounds; as, nitrosyl sulphuric acid. Used also adjectively..

Intrinsic :: Intrinsic (a.) Included wholly within an organ or limb, as certain groups of muscles; -- opposed to extrinsic..

Acraspeda :: Acraspeda (n. pl.) A group of acalephs, including most of the larger jellyfishes; the Discophora..

Lanthanum :: Lanthanum (n.) A rare element of the group of the earth metals, allied to aluminium. It occurs in certain rare minerals, as cerite, gadolinite, orthite, etc., and was so named from the difficulty of separating it from cerium, didymium, and other rare elements with which it is usually associated. Atomic weight 138.5. Symbol La..

Mica :: Mica (n.) The name of a group of minerals characterized by highly perfect cleavage, so that they readily separate into very thin leaves, more or less elastic. They differ widely in composition, and vary in color from pale brown or yellow to green or black. The transparent forms are used in lanterns, the doors of stoves, etc., being popularly called isinglass. Formerly called also cat-silver, and glimmer..

Manna Croup :: Manna croup () The portions of hard wheat kernels not ground into flour by the millstones: a kind of semolina prepared in Russia and used for puddings, soups, etc. -- called also manna groats..

Hamilton Period :: Hamilton period () A subdivision of the Devonian system of America; -- so named from Hamilton, Madison Co., New York. It includes the Marcellus, Hamilton, and Genesee epochs or groups. See the Chart of Geology..

Cormophylogeny :: Cormophylogeny (n.) The phylogeny of groups or families of individuals.

Brachyura :: Brachyura (n. pl.) A group of decapod Crustacea, including the common crabs, characterized by a small and short abdomen, which is bent up beneath the large cephalo-thorax. [Also spelt Brachyoura.] See Crab, and Illustration in Appendix..

Mould :: Mould (n.) A growth of minute fungi of various kinds, esp. those of the great groups Hyphomycetes, and Physomycetes, forming on damp or decaying organic matter..

Foil :: Foil (n.) The space between the cusps in Gothic architecture; a rounded or leaflike ornament, in windows, niches, etc. A group of foils is called trefoil, quatrefoil, quinquefoil, etc., according to the number of arcs of which it is composed..

Chaetognatha :: Chaetognatha (n. pl.) An order of free-swimming marine worms, of which the genus Sagitta is the type. They have groups of curved spines on each side of the head..

Entomophaga :: Entomophaga (n. pl.) A group of marsupials which are partly insectivorous, as the opossum..

Alectorides :: Alectorides (n. pl.) A group of birds including the common fowl and the pheasants.

Endoplastica :: Endoplastica (n. pl.) A group of Rhizopoda having a distinct nucleus, as the am/ba..

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