cytoma

Etymology
Either (1) an outdated coinage from the days when word production with the suffix wasn't yet restricted semantically to neoplasms (19th century), or (2) back-formed via slightly misguided  from various words for tumors (such as, , , and ); possibly generated via both routes, if reinvented independently.

Noun

 * 1)  A cellular tumor.

Usage notes
This is a rare and outdated word that has no use in present-day histopathology. It looks like the tail end of various words for tumors (such as, , , and ), but such words are not formed from any putative pattern of X- + *cytoma; rather, they are formed from the pattern of X-cyte + , "a tumor composed of X-cytes, that is, X type of cells".