Back Regla de Wahl AST Regla de Wahl Catalan Regulo de Wahl Esperanto Regla de Wahl Spanish De Wahli reegel Estonian Regra de Wahl Galician Regula de Wahl Interlingua Regul de Wahl Interlingue Regola di de Wahl Italian Regola ta' De Wahl Maltese
De Wahl's rule is a rule of word formation, developed by Baltic German naval officer and teacher Edgar de Wahl and applied in the constructed language Interlingue, which was also his creation.
The rule served for the formation of certain changed grammatical forms, like adjectives and nouns, from verb infinitive.
Edgar de Wahl observed existing patterns of sound changes that occurred in natural languages (d to s, r to t, etc.). The purpose of his rule was to distill these patterns into a regular and logical system that is reproducible yet also natural in appearance.