wel ‧ ter /ˈweltə $ -ər/ BrE AmE noun
[ Date: 1800-1900 ; Origin: welter 'state of confusion' (16-19 centuries) , from welter 'to roll about, be in a state of confusion' (14-20 centuries) , from Middle Dutch welteren or Middle Low German weltern ]
a welter of something a large and confusing amount or number of something:
There is a welter of information on the subject.