Deorsumvergence is not a commonly used word, but it is spelled according to its Latin roots. The word refers to a downward movement or slope, and is pronounced as /diːɔːsʌmvɜːdʒəns/. The IPA transcription shows that the emphasis is on the second syllable, with a long "e" sound in the first syllable and a short "u" sound in the third syllable. "Deorsum" means "downward" and "vergence" means "convergence" or "tendency," which together create the meaning of the word.
Bending or inclining downward, deorsumduction.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.