[8] tvíbyrðingr (m.) ‘double-boarded one’: The heiti evidently refers to a shield made of two layers of wood (cf. tvíbyrðr skjǫldr; see Falk 1914b, 129-30; SnE 1998, II, 415), from tví- ‘double’ and borð (see borði ‘boarded one’, l. 6 above). It is not used elsewhere as a heiti for ‘shield’.