lath

Etymology

From Middle English laththe, laþþe, earlier lathe, laþe, altered from Old English lætt (“lath”), from Proto-West Germanic *lattu, from Proto-Germanic *lattō, *laþþō (compare Dutch lat, German Latte) from Proto-Indo-European *(s)lat- (compare Welsh llath (“rod, wand, yard”)).

noun

1. A thin, narrow strip, fastened to the rafters, studs, or floor beams of a building, for the purpose of supporting a covering of tiles, plastering, etc.
   The rubble waits him, sloping up to broken rear walls in a clogging, an openwork of laths pointlessly chevroning-flooring, furniture, glass, chunks of plaster, long tatters of wallpaper, split and shattered joists […]. 1973, Thomas Pynchon, Gravity's Rainbow
   Lanna says about wishing she was bigger in the chest and I goes that I had nothing to beat there and I was thin as a lat. 1995, Alan Warner, Morvern Callar, Vintage, published 2015, page 21
2. (geology, petrology) Microscopic, needle-like crystals, usually of plagioclase feldspar, in a glassy groundmass
3. (mining) one of the sharp-edged, thick planks driven forward to hold back loose earth or mud when digging the way through for tunnelling or spiling. Also called a spill.

verb

1. to cover or line with laths