I am looking for a word that refers to the state of appearing as only a head without a body, as in the case of an apparition or god. I think the word would be used in a sentence something like this: "The goddess Athena appeared [blank] to him and foretold his future."
I know I have run into the word in use before and had to look it up. But I have forgotten what the word is. I am pretty sure that I found the word on Dictionary.com. To my best recollection, it is a foreign-sounding word, most likely Latin[ish].