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time , in music

(Encyclopedia)time, in music: see tempo; meter; rhythm; syncopation; metronome and musical notation. ...

ray, in physics

(Encyclopedia)ray, in physics, term denoting the straight line along which light or other form of radiation is propagated from its source. It generally refers to the line of propagation of waves but is also applied...

periwinkle, in zoology

(Encyclopedia)periwinkle, any of a group of marine gastropod mollusks having conical, spiral shells. Periwinkles feed on algae and seaweed. They are found at the water's edge; out of water, they resist drying by cl...

eclecticism, in philosophy

(Encyclopedia)eclecticism ĭklĕkˈtĭsĭzˌəm [key] [Gr. eklektikos=to choose], in philosophy, the selection of elements from different systems of thought, without regard to possible contradictions between the sy...

sublimation, in chemistry

(Encyclopedia)sublimation sŭblĭmāˈshən [key], change of a solid substance directly to a vapor without first passing through the liquid state. The term is also used to describe the reverse process of the gas ch...

columbine, in botany

(Encyclopedia)columbine kŏlˈəmbīn [key], any plant of the genus Aquilegia, temperate-zone perennials of the family Ranunculaceae (buttercup family), popular both as wildflowers and as garden flowers. Columbines...

earth, in chemistry

(Encyclopedia)earth, in chemistry, metallic oxide not readily reducible by chemical means, e.g., alkaline earths, rare earths, and alumina. The name is also applied to certain absorbent clays, e.g., fuller's earth,...

Tatian

(Encyclopedia)Tatian tāˈshən [key], 2d cent., Christian apologist. Probably born in Syria, he was a pupil of Justin Martyr. After his master's death, he left Christianity, becoming an Encratitic Gnostic—i.e., ...

corona, in astronomy

(Encyclopedia)corona, luminous envelope surrounding the sun, outside the chromosphere. Its density is less than one billionth that of the earth's atmosphere. The corona is visible only at the time of totality durin...

Aksum

(Encyclopedia)Aksum or Axum both: äkso͞omˈ [key], town , Tigray region, N Ethiopia. Aksum was the capital of an empire (c.1st–8th cent. a.d.) that controlled much of what is now N ...