\For"ti*eth\, a. [AS. fe['o]wertigo?a. See {Forty}.]
1. Following the thirty-ninth, or preceded by thirty-nine
   units, things, or parts.
2. Constituting one of forty equal parts into which anything
   is divided.

\For"ti*eth\, n.
One of forty equal parts into which one whole is divided; the
quotient of a unit divided by forty; one next in order after
the thirty-ninth.