T1I1E1R1C3E1R1O1N1S1
12 points
TIERCERONS is validvalid
TIERCERON, [n]
TIERCERON, a subordinate rib springing from the intersection of two other ribs [n]
TIERCERON, [n]
TIERCERON, a subordinate rib springing from the intersection of two other ribs [n]