Adiantites is a rare, mineralogical term used to refer to a type of fossil fern. It is pronounced as [ædɪəntaɪtks]. The first syllable of the word is pronounced as "ad" sounding like "add," followed by "i" as in "it," and ending with "antites" pronounced with a soft "a" sound like "ah" as in "antics" and "tites" sounding like "tights." The correct spelling of this word is essential in scientific writing, where precise terminology is critical.
A genus of fossil ferns found in the coal-measures, so called from their resemblance to the existing adiantum or maiden-hair.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.