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An alkaloid found in opium in small quantities, and extracted as a white crystalline substance.

That part of any substance or fixture which extends over, or lies upon, or by the side of, a part of another; as, the lap of a board; also, the measure of such extension over or upon another thing.

A hardening into a stone substance.

Any substance which has the quality of petrifying other bodies, or of converting or being converted into stone.

A peculiar amyloid substance, colored blue by iodine and sulphuric acid, occurring mainly as an abnormal infiltration into the spleen, liver, etc.

um, of several species (as L. glabrum, and L. siler), the root of which yields a resinous substance of a bitter taste. The genus is mostly European.

m, the European bay or laurel (Laurus nobilis). Lauric acid (Chem.), a white, crystalline substance, C12H24O2, resembling palmitic acid, and obtained from the fruit of the bay tree, and other sources.

A white crystalline substance extracted from the fruit of the bay (Laurus nobilis), and consisting of a complex mixture of glycerin ethers of several organic acids.

ottom of a sounding lead with tallow in order to discover the nature of the bottom by the substances adhering. Ham. Nav. Encyc. -- To cast, or heave, the lead, to cast the sounding lead for ascertaining the depth of water. -- White lead, hydrated carbonate of lead, obtained as a white, amorphous powder, and much used…

Any substance that produces, or is designed to produce, fermentation, as in dough or liquids; esp., a portion of fermenting dough, which, mixed with a larger quantity of dough, produces a general change in the mass, and renders it light; yeast; barm.

ined from several varieties of lichen (Lecanora, Roccella, etc.), as a white, crystalline substance, and is called also orsellic, or diorsellinic acid, lecanorin, etc.

A complex, nitrogenous phosphorized substance widely distributed through the animal body, and especially conspicuous in the brain and nerve tissue, in yolk of eggs, and in the white blood corpuscles.

An albuminous substance resembling casein, found as a characteristic ingredient of the seeds of leguminous and grain- bearing plants.

yellow European sole (Solea aurantiaca). -- Salts of lemon (Chem.), a white crystalline substance, inappropriately named, as it consists of an acid potassium oxalate and contains no citric acid, which is the characteristic acid of lemon; -- called also salis of sorrel. It is used in removing ink stains. See Oxalic ac…

A piece of glass, or other transparent substance, ground with two opposite regular surfaces, either both curved, or one curved and the other plane, and commonly used, either singly or combined, in optical instruments, for changing the direction of rays of light, and thus magnifying objects, or otherwise modifying visio…

A white, crystalline, nitrogenous substance formed in the decomposition of albuminous matter by pancreatic digestion, by the action of boiling dilute sulphuric acid, and by putrefaction. It is also found as a constituent of various tissues and organs, as the spleen, pancreas, etc., and likewise in the vegetable kingdom…

A colorless substance isomeric with chlorophyll, contained in parts of plants capable of becoming green. Watts.

Pertaining to, or designating, a nitrogenous organic substance of the uric acid group, called leucoturic acid or oxalantin. See Oxalantin.

ransmitting and modifying force and motion. Specif., a bar of metal, wood, or other rigid substance, used to exert a pressure, or sustain a weight, at one point of its length, by receiving a force or power at a second, and turning at a third on a fixed point called a fulcrum. It is usually named as the first of the six…

relative lightness, especially as shown by rising through, or floating upon, a contiguous substance; buoyancy; -- opposed to gravity. He gave the form of levity to that which ascended; to that which descended, the form of gravity. Sir. W. Raleigh. This bubble by reason of its comparative levity to the fluidity that inc…