treat of

English

Verb

treat of (third-person singular simple present treats of, present participle treating of, simple past and past participle treated of)

1. (dated) To deal with (a subject).
   • 1905, Charles Rochester Eastman, A brief general account of fossil fishes:

     In the same way, palaeichthyology, or that branch of natural science which treats of fossil fishes, extends our information from the existing fauna back to the earliest advent of vertebrate life upon our globe […]