Hláfmæsse-dæg

According to the Old English Dictionary:

es;

hláfmæsse-dæg

m. Lammas-day, the first of August :-- Of ðam gehálgedan hláfe ðe man hálige on hláfmæssedæg from the hallowed bread which is hallowed on Lammas-day, Lchdm. iii. 290, 27. Ǽr hláfmæsse [dǽge?], L. M. 1, 72; Lchdm. ii. 146, 9. Æfter hlámmǽssedæge, Chr. 1100; Erl. 235, 33. hlafmæsse-dæg