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rge class of organic substances resembling the aldehydes, obtained by the distillation of certain salts of organic acids and consisting of carbonyl (CO) united with two hydrocarbon radicals. In general the ketones are colorless volatile liquids having a pungent ethereal odor.

Prepared leaves or bark of certain plants; -- used by the Indians of the Northwest for smoking, either mixed with tobacco or as a substitute for it. Also, a plant so used, as the osier cornel (Cornus stolonijra), and the bearberry (Arctostaphylus Uva-ursi). [Spelled also kinnickinnick and killikinick.]…

The dark red dried juice of certain plants, used variously in tanning, in dyeing, and as an astringent in medicine.

A name given to certain catechumens and penitents who were permitted to join only in parts of church worship.

In feudal times, a man-at-arms serving on horseback and admitted to a certain military rank with special ceremonies, including an oath to protect the distressed, maintain the right, and live a stainless life.

To perceive or apprehend clearly and certainly; to understand; to have full information of; as, to know one's duty. O, that a man might know The end of this day's business ere it come! Shak. There is a certainty in the proposition, and we know it. Dryden. Know how sublime a thing it is To suffer and be strong. Longfell…

The act or state of knowing; clear perception of fact, truth, or duty; certain apprehension; familiar cognizance; cognition. Knowledge, which is the highest degree of the speculative faculties, consists in the perception of the truth of affirmative or negative propositions. Locke.

A small appendage beneath the upper lip or labrum of certain insects.

Having the appearance of being labiate; -- said of certain polypetalous corollas.

The latex of certain plants. See Latex.

One of a series of organic compounds, regarded as anhydrides of certain hydroxy acids. In general, they are colorless liquids, having a weak aromatic odor. They are so called because the typical lactone is derived from lactic acid.

Pertaining to, or derived from, the juice of the Lactuca virosa; -- said of certain acids.

A gum resin gathered from certain Oriental species of Cistus. It has a pungent odor and is chiefly used in making plasters, and for fumigation. [Written also labdanum.]

Those who are not of a certain profession, as law or medicine, in distinction from those belonging to it.

hysical environments, and esp., in the case of animals, by effort, or by use or disuse of certain organs.

a thin plate or scale of anything, as a thin scale growing from the petals of certain flowers; or one of the thin plates or scales of which certain shells are composed.

Having antennæ terminating in a group of flat lamellæ; -- said of certain coleopterous insects.

A set of quadrilles of a certain arrangement. [Written also lanciers.]

-- called also pectoral rail. -- Land scrip, a certificate that the purchase money for a certain portion of the public land has been paid to the officer entitled to receive it. [U.S.] -- Land shark, a swindler of sailors on shore. [Sailors' Cant] -- Land side (a) That side of anything in or on the sea, as of an island…

That part of the hilt, in certain kinds of swords, which overlaps the scabbard.