CONCENTRIC

concentric, concentrical, homocentric

(adjective) having a common center; “concentric rings”

Source: WordNet® 3.1

Etymology

Adjective

concentric (comparative more concentric, superlative most concentric)

(geometry) Having a common center.

(physiology) (of a motion) in the direction of contraction of a muscle. (E.g. extension of the lower arm via the elbow joint while contracting the triceps and other elbow extensor muscles; closing of the jaw while flexing the masseter).

Antonym: eccentric. Concentric and eccentric movements are collectively referred to as isotonic (with motion), the antonym of which is isometric (without motion).

Antonyms

• (physiology): eccentric

Source: Wiktionary

Con*cen"tric, Con*cen"tric*al, a. Etym: [F. concentrique. See Concenter.]

Definition: Having a common center, as circles of different size, one within another. Concentric circles upon the surface of the water. Sir I. Newton. Concentrical rings like those of an onion. Arbuthnot.

Con*cen"tric, n.

Definition: That which has a common center with something else. Its pecular relations to its concentrics. Coleridge.

Source: Webster’s Unabridged Dictionary 1913 Edition