ferrule

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fer·rule

(fer'ūl),
A metal band or ring used around the crown or root of a tooth.
[corrupted through O. Fr. and Medieval L., fr. L. viriola, a small bracelet]

ferrule

(fĕr′ūl) [L. viriola, little bracelet]
A band or ring of metal applied to the end of the root or crown of a tooth to strengthen it.

fer·rule

(fer'ūl)
Metal band or ring fitted around the crown or root of a tooth for strength.
[corrupted through O. Fr. and Medieval L., fr. L. viriola, a small bracelet]