Tail-bay
Pronunciation : Tail"-bay`
Part of Speech : n.
Definition : 1. (Arch.)
Defn: One of the joists which rest one end on the wall and the other on a girder; also, the space between a wall and the nearest girder of a floor. Cf. Case-bay.
2. The part of a canal lock below the lower gates.
Source : Webster's Unabridged Dictionary, 1913