/an"yeuh leuhs/ , n. , pl. annuli /-luy'/ , annuluses .
1. a ring; a ringlike part, band, or space.
2. Geom. the space between two concentric circles on a plane.
3. the veil remnant on a mushroom stalk. See illus. under mushroom .
4. a growth ring, as on the cross section of a tree trunk, that can be used to estimate age.
[ 1555-65; an ( us ) ring + -ulus -ULE ]