troch-
combining form 
or trocho-
Etymology: New Latin, from Greek, from trochos wheel, from trechein to run — more at trochee 
 : wheel : resembling a wheel : round 
< Trochodendron >
< Trochelminthes >
< trochophora >
or trocho-
< Trochodendron >
< Trochelminthes >
< trochophora >