circulus

(redirected from Michael Tyack)
Also found in: Medical.

circulus

[′sər·kyə·ləs]
(biology)
Any of various ringlike structures, such as the vascular circle of Willis or the concentric ridges on fish scales.
References in periodicals archive ?
There was an idea that we could be a hoax, that we were doing it just for a laugh," says founder Michael Tyack.
Choreography, Anthony van Laast; music supervisor, Max Lambert; musical direction; Michael Tyack.