annulus
Pronunciation: [ˈæn.jʊ.ləs]
Word
Context: "geometry"
(noun) an annulus is a ring-shaped object. It looks like a circle with a hole in the middle. Imagine a donut; the outer edge is one circle, and the hole is another smaller circle inside.
Example
The playground has an annulus shape, making it perfect for playing ring toss.
Example
The shape of the table is not an annulus; it is a solid square.
Example
Can you draw an annulus with a big circle and a small circle inside?
Context: "anatomy"
(noun) in biology, an annulus can refer to a ring-like structure in some plants or animals. For example, some mushrooms have annulus shapes around their stems.
Example
The mushroom had a beautiful annulus that looked like a tiny collar.
Example
This type of mushroom doesn't have an annulus, so it looks very different.
Example
What does the annulus on the mushroom tell us about its age?
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