(i ertha, in erthar). Isolated from the gerund #erthad (itself isolated from aderthad "reunion").
Sindarin
ertha-
verb. to unite
ertha-
verb. to unite
ertha
unite
ertha
unite
Quenya
erta-
verb. to unite
Beware, older languages below! The languages below were invented during Tolkien's earlier period and should be used with caution. Remember to never, ever mix words from different languages!
Gnomish
er(e)tha-
verb. to isolate, rob, deprive
#ertha- (i ertha, in erthar). Isolated from the gerund #erthad (itself isolated from aderthad "reunion").