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Any of several large groupers of warm seas, esp. the guasa (Epinephelus guaza), the red grouper (E. morio), the black grouper (E. nigritas), distinguished as Me"ro de lo al"to, and a species called also rock hind, distinguished as Me"ro ca*brol"la.

s, Eurypteroidea, and Limuloidea. All are extinct except the horseshoe crabs of the last group. See Limulus.

A zeolitic mineral, grayish white or yellowish, occuring in delicate groups of crystals, also fibrous massive. It is a hydrous silicate of alumina, lime, and soda.

A group of very lowly organized, wormlike parasites, including the Dicyemata. They are found in cephalopods. See Dicyemata.

A comprehensive group of insects, including those that undegro a metamorphosis.

ad, tin, or cadmium. -- Heavy metals (Chem.), the metallic elements not included in the groups of the alkalies, alkaline earths, or the earths; specifically, the heavy metals, as gold, mercury, platinum, lead, silver, etc. -- Light metals (Chem.), the metallic elements of the alkali and alkaline earth groups, as sodi…

That variety of xylene, or dimethyl benzene, in which the two methyl groups occupy the meta position with reference to each other. It is a colorless inf

e cells around it are at first arranged in two layers, -- the ectoderm and endoderm. The group comprises nearly all animals except the Protozoa.

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., be…

A mineral of the feldspar group, like orthoclase or common feldspar in composition, but triclinic in form.

the islands in the western part of the Pacific Ocean, embracing the Marshall and Gilbert groups, the Ladrones, the Carolines, etc.

One of a group of mammals having a small size as a typical characteristic. It includes the lower orders, as the Insectivora, Cheiroptera, Rodentia, and Edentata.

The same Milliolitic. Miliolite limestone (Geol.), a building stone, one of the group of the Paris basin, almost entirely made up of many-chambered microscopic shells.

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

and shades upon its surface. Moldings vary greatly in pattern, and are generally used in groups, the different members of each group projecting or retreating, one beyond another. See Cable, n., 3, and Crenelated molding, under Crenelate, v. t.

onnected with, produced by, or consisting of, molecules; as, molecular forces; molecular groups of atoms, etc. Molecular attraction (Phys.), attraction acting between the molecules of bodies, and at insensible distances. -- Molecular weight (Chem.), the weight of a molecule of any gas or vapor as compared with the hyd…

A group of atoms so united and combined by chemical affinity that they form a complete, integrated whole, being the smallest portion of any particular compound that can exist in a free state; as, a molecule of water consists of two atoms of hydrogen and one of oxygen. Cf. Atom.

A rare element of the chromium group, occurring in nature in the minerals molybdenite and wulfenite, and when reduced obtained as a hard, silver-white, difficulty fusible metal. Symbol Mo. Atomic weight 95.9.

An amido compound with only one amido group.

A basic compound containing one amido group; as, methyl amine is a monamine.