The word "novrenin" appears to be a made-up word with no clear definition. However, its spelling can be broken down using the International Phonetic Alphabet (IPA) as follows: /nɑv-rə-nɪn/. This indicates that the first syllable has the sound of "nav" like "navy", the second syllable has a schwa sound, and the final syllable has the sound of "nin" like "nine". While the word may not have a specific meaning, breaking down its spelling using IPA can help with pronunciation and understanding of other words in the future.
Trade name of a 2 per cent. solution of novocaine in a 1:20,000 solution of adrenalin chloride in physiological salt solution.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.