— joistless , adj.
/joyst/ , n.
1. any of a number of small, parallel beams of timber, steel, reinforced concrete, etc., for supporting floors, ceilings, or the like.
v.t.
2. to furnish with or fix on joists.
[ 1325-75; ME giste jacitum support, n. use of neut. of L jacitus (ptp. of jacere to lie), equiv. to jaci- var. s. + -tus ptp. suffix ]