The word weduwnaar means widower. In most marriage records, even the early ones, the fact that groom is a widower will be mentioned. If you’re lucky, the name of the previous spouse is mentioned too, but that has only been required since the civil registration (1811 or slightly earlier).
![Etch of an older man holding a woman's had](https://www.dutchgenealogy.nl/wp-content/uploads/2013/11/CourtingWidower-535x672.jpg)
Courting widower. Image credits: Rijksmuseum