Ring-shaped objects

• Tree rings
• Ringlike parts
• To cancel, one rings
• Trees' age indicators
• Yearly tree growths
• Tree's age indicators
• Halo shapes

WordNet Word definitions in WordNet
See annulus

Wiktionary Word definitions in Wiktionary
n. (en-irregular plural of: annulus )

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Annulus \An"nu*lus\, n.; pl. Annuli . [L.] A ring; a ringlike part or space. (Geom.) A space contained between the circumferences of two circles, one within the other. The solid formed by a circle revolving around a line which is the plane of the circle ...