vijftig

Etymology
From, from , from.

Numeral

 * 1) fifty

Usage notes
Although spelt with, the word is traditionally pronounced with initial even in accents that generally do not devoice v-. (This is due to analogy with ["seventy"], which used to have a prefix t- and hence a devoiced z-). However, there are also many speakers who pronounce in line with the spelling as a hypercorrection.