adjective : of or relating to the underworld : infernal
This 19th-century word begins with a series of two digraphs that do not typically hook up. In fact, the only other English word in established use that begins with this same series of letters is the variant of chthonic, chthonian. Both have their origin in the Greek chthon- or chthōn, meaning "earth." A note on pronunciation: the ch is silent, so play and play .