[1] : The Collaborative International Dictionary of English v.0.48

joist \joist\ joist, n. oe. giste, of. giste, f. g^ite, fr.
   gesir to lie, f. g'esir. see gist. arch.
   a piece of timber laid horizontally, or nearly so, to which
   the planks of the floor, or the laths or furring strips of a
   ceiling, are nailed; -- called, according to its position or
   use, binding joist, bridging joist, ceiling joist,
   trimming joist, etc. see illust. of double-framed floor,
   under double, a.
   1913 webster
see also:
gist binding joist bridging joist ceiling joist trimming joist double-framed floor 
double 

[2] : The Collaborative International Dictionary of English v.0.48

bridgeing \bridge"ing\, n. arch.
   the system of bracing used between floor or other timbers to
   distribute the weight.
   1913 webster

   bridging joist. same as binding joist.
      1913 webster
see also:
bridging joist binding joist 

Joist >> J Words
Joist, definition of term: Joist
joist_pag1.html

Bridging >> B Words
Bridging, definition of term: Bridging
bridging_pag1.html

Tail Joist >> T Words
Tail Joist, definition of term: Tail Joist
tail+joist_pag1.html

Ceiling Joist >> C Words
Ceiling Joist, definition of term: Ceiling Joist
ceiling+joist_pag1.html