0 Concentric circles and rings have the same centre:
a concentric pattern
1 (of circles and rings) being one inside another and having the same center
A purely elastic instability apparently also occurs by a similar mechanism in other rotational shearing flows, namely concentric plate-and-plate flow and concentric cone-and-plate flow.
The internal and external elastic laminae are thick concentric elastic-fibre layers that separate the intima and media, and the media and adventitia, respectively.
Concentric-whorled membranes, having a granular appearance resembling the ribosomes of rough endoplasmic reticulum, float in the pseudocoelom between somatic muscles, reproductive tract and intestine.
The concentric spherical shells, the so called "onions," constitute a form of carbon consisting of spherical concentric layers of carbon shells.
Euhedral concentric zoning is common in most crystals.
Again the isobars are concentric cylinders about the origin 0 and correspond with a pressure maximum.
The inner crater in the crystalline basement is often the only part of the concentric structure that is preserved or recognizable.
The excretory pore is located at the posterior extremity of the worm with the tegument forming tight concentric bands around the pore.
