Rihtung-þrǽdBosworth & Toller 盎格鲁-撒克逊古英语词典 - rihtung-þrǽd根据古英语词典：es;rihtung-þrǽdm. A directing thread, a plumb-line :-- Wealles rihtungþréd perpendiculum, Wrt. Voc. i. 39, 64. rihtung-þræd