Eight″eenth′ (?), a. [From Eighteen.] 1. Next in order after the seventeenth.
2. Consisting of one of eighteen equal parts or divisions of a thing.
Webster's Dictionary 1913
Eight″eenth′ (?), a. [From Eighteen.] 1. Next in order after the seventeenth.
2. Consisting of one of eighteen equal parts or divisions of a thing.