The spelling of the word "derrengadera" can be attributed to its origin in the Bantu language. In IPA phonetic transcription, the word is spelled /dɛrɛ̃ŋgadera/, with the nasal vowels and the palatalized /ɲ/ consonant indicating the Bantu influence. The repetition of the syllable "der" can be a reduplication used for emphasis or for creating a new word. The spelling of this word demonstrates the importance of understanding the etymology of a word to accurately determine its spelling and pronunciation.
Murrina, especially that form in which posterior paralysis is marked.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.