1) Hexacanth 
An oncosphere is the larval form of a tapeworm once it has been ingested by an intermediate host animal. The intermediate host must ingest the tapeworm`s eggs either in food or water-- once this has happened, the eggs hatch and develop into oncospheres which will then burrow through the gut wall of the intermediate host in order to access the org....
Synonym: hexacanth. ... Origin: onco-+ G. Sphaira, sphere ... (05 Mar 2000) ... 
(ong´ko-sfēr) the larva of the tapeworm contained within the external embryonic envelope and armed with six hooks.
Type: Term Pronunciation: ong′kō-sfēr Synonyms: hexacanth
oncosphere The ciliated six-hooked larva of the tapeworm contained within the external embryonic envelope and armed with six hooks; it may be found in feces.