B3O1T1H4R1I1U1M3
15 points
BOTHRIUM is validvalid
a groove on a tapeworm [n BOTHRIA, BOTHRIUMS]
(Latin) a groove on a tapeworm [n BOTHRIUMS or BOTHRIA]
a groove on a tapeworm [n BOTHRIA, BOTHRIUMS]
(Latin) a groove on a tapeworm [n BOTHRIUMS or BOTHRIA]