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Requirement :: Requirement (n.) That which is required; an imperative or authoritative command; an essential condition; something needed or necessary; a need.

Variation :: Variation (n.) Repetition of a theme or melody with fanciful embellishments or modifications, in time, tune, or harmony, or sometimes change of key; the presentation of a musical thought in new and varied aspects, yet so that the essential features of the original shall still preserve their identity..

Substance :: Substance (n.) The most important element in any existence; the characteristic and essential components of anything; the main part; essential import; purport.

Volumescope :: Volumescope (n.) An instrument consisting essentially of a glass tube provided with a graduated scale, for exhibiting to the eye the changes of volume of a gas or gaseous mixture resulting from chemical action, and the like..

Hepar :: Hepar (n.) Liver of sulphur; a substance of a liver-brown color, sometimes used in medicine. It is formed by fusing sulphur with carbonates of the alkalies (esp. potassium), and consists essentially of alkaline sulphides. Called also hepar sulphuris (/)..

Sycock :: Sycoceryl (n.) A radical, of the aromatic series, regarded as an essential ingredient of certain compounds found in the waxy resin of an Australian species of fig..

Cutose :: Cutose (n.) A variety of cellulose, occuring as a fine transparent membrane covering the aerial organs of plants, and forming an essential ingredient of cork; by oxidation it passes to suberic acid..

Cellulose :: Cellulose (n.) The substance which constitutes the essential part of the solid framework of plants, of ordinary wood, linen, paper, etc. It is also found to a slight extent in certain animals, as the tunicates. It is a carbohydrate, (C6H10O5)n, isomeric with starch, and is convertible into starches and sugars by the action of heat and acids. When pure, it is a white amorphous mass. See Starch, Granulose, Lignin..

Lactucone :: Lactucone (n.) A white, crystalline, tasteless substance, found in the milky sap of species of Lactuca, and constituting an essential ingredient of lactucarium..

Distill :: Distill (v. t.) To obtain by distillation; to extract by distillation, as spirits, essential oil, etc.; to rectify; as, to distill brandy from wine; to distill alcoholic spirits from grain; to distill essential oils from flowers, etc.; to distill fresh water from sea water..

Bergamot :: Bergamot (n.) A tree of the Orange family (Citrus bergamia), having a roundish or pear-shaped fruit, from the rind of which an essential oil of delicious odor is extracted, much prized as a perfume. Also, the fruit..

Radical :: Radical (n.) A characteristic, essential, and fundamental constituent of any compound; hence, sometimes, an atom..

Organule :: Organule (n.) One of the essential cells or elements of an organ. See Sense organule, under Sense..

Bole :: Bole (n.) Any one of several varieties of friable earthy clay, usually colored more or less strongly red by oxide of iron, and used to color and adulterate various substances. It was formerly used in medicine. It is composed essentially of hydrous silicates of alumina, or more rarely of magnesia. See Clay, and Terra alba..

Adventitious :: Adventitious (a.) Added extrinsically; not essentially inherent; accidental or causal; additional; supervenient; foreign.

Parallel :: Parallel (a.) Continuing a resemblance through many particulars; applicable in all essential parts; like; similar; as, a parallel case; a parallel passage..

Gratiolin :: Gratiolin (n.) One of the essential principles of the hedge hyssop (Gratiola officinalis).

Self-contained :: Self-contained (a.) Having all the essential working parts connected by a bedplate or framework, or contained in a case, etc., so that mutual relations of the parts do not depend upon fastening outside of the machine itself..

Opera :: Opera (n.) A drama, either tragic or comic, of which music forms an essential part; a drama wholly or mostly sung, consisting of recitative, arials, choruses, duets, trios, etc., with orchestral accompaniment, preludes, and interludes, together with appropriate costumes, scenery, and action; a lyric drama..

Diachylum :: Diachylum (n.) A plaster originally composed of the juices of several plants (whence its name), but now made of an oxide of lead and oil, and consisting essentially of glycerin mixed with lead salts of the fat acids..

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