CONCENTRICAL
concentric, concentrical, homocentric
(adjective) having a common center; “concentric rings”
Source: WordNet® 3.1
Adjective
concentrical (comparative more concentrical, superlative most concentrical)
Alternative form of concentric
The manner of its concretion is by concentrical rings, like those of an onion about the first kernel.
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.
Source: Webster’s Unabridged Dictionary 1913 Edition