shit.tah denotes wood used for the ark, table, altars, poles, boards, and pillars, and names a tree in Isaiah 41:19.

The plural form regularly denotes a material used to make or furnish the ark, table, altars, poles, boards, bars, and pillars; the singular in Isaiah 41:19 names one tree among those given in the wilderness.

1. Wood for constructed furnishings and structures · dominant

   The plural form occurs as the material for objects and structural elements: in Exodus 25:10 the APB renders an ark made of “acacia wood,” and in Exodus 26:15 it renders boards for the tabernacle made of that wood. The same material is used for poles, altars, bars, and pillars in the cited verses.

   Exodus 25:10Exodus 25:13Exodus 26:15Exodus 27:1Exodus 30:1Exodus 37:1
2. A tree named in wilderness planting · rare

   In Isaiah 41:19, the singular form is listed with cedar, myrtle, cypress, elm, and box tree in the APB’s rendering of trees placed in the wilderness and Arabah.

   Isaiah 41:19

In the Anselm Project Bible: Across the construction verses, the APB commonly renders the material as “acacia wood,” while Exodus 36:36 uses “acacia” for pillars. In Isaiah 41:19 it renders the singular as “the acacia”; these are translation renderings rather than definitions.