Answer: annulus

AnswerCrossword Clue
ANNULUSTree ring
ANNULUSTree ring, for one
ANNULUSRinglike marking.
ANNULUSGrowth ring
annulusthe space between two concentric circles on a plane
annulusthe veil remnant on a mushroom stalk
annulusgrowth ring, as on the cross section of a tree trunk, that can be used to estimate age
annulusa ring or ringlike part
annulusring; ringlike part, band, or space