a. [f. Icel. tólf-rǽðr adj. only in comb. tolfrǽt hundrað, a hundred of twelve tens (f. tólf twelve + rǽða (:—rǽða) to speak) + -IC.] Duodecimal: applied to the ancient Scandinavian system of reckoning, in which twelve tens were counted as a hundred (cf. HUNDRED 3).
[Cf. 1703. Hickes, Thesaurus, I. III. 43.]
1813. Ellis, Brand’s Pop. Antiq., II. 325. The Doctor observes that this Tolfrædic mode of computation by the greater decads, or tens which contain twelve units, is still retained amongst us in reckoning certain things by the number twelve.
1905. Daily Chron., 16 June, 4/6. The tolfraedic ten meant twelve, the tolfraedic hundred meant a hundred and twenty, and so on.
