Juvantia is a word that is not commonly used in everyday language. It is typically spelled with the letters J-U-V-A-N-T-I-A, and pronounced as dʒuːˈvæntɪə. The phonetic transcription of this word can help to explain its spelling. The use of the letter J indicates that the first sound is a voiced palato-alveolar affricate, while the U following it represents a long vowel sound. The V sound is pronounced as a voiced labiodental fricative, followed by the stressed A sound, and ending with a schwa sound represented by the letters I-A.
I apologize, but "juvantia" does not appear to be a well-known word in the English language. Therefore, there is no established dictionary definition available. It is possible that "juvantia" may be a rare or specialized term specific to a certain field or context. If you can provide more context or information about the word, I may be able to assist further.
Adjuvants, remedies or appliances which assist or intensify the action of others.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.