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14 minutes ago, Frosty said:

So what's the problem calling growth rings annular rings, isn't one revolution around the sun, an Annulus? The root of the term Annual?

There's no problem with calling growth rings "annular rings"; that's the proper term.

"Annual" and "annular" actually come from two different (albeit related) roots. As previously discussed, "annulus" comes from "anulus", which is the diminutive of "anus", meaning "ring". "Annular" comes from "annus", which means "year" (this is the same root as "annals", as in history). The relation between the two is that "annus" can refer to a planet's circuit, although "cursus" ("course") was also used for this.

One revolution around the sun isn't an annulus, since it neither has width (only direction) nor is circular.

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