sar.pad denotes a plant named in Isaiah's contrast between what is removed and the myrtle that comes up instead.

The term names a plant placed in Isaiah 55:13 within a contrast: it is replaced by the myrtle.

1. A plant replaced by the myrtle · dominant

   In Isaiah 55:13, the masculine singular absolute form occurs in the clause contrasting this plant with the myrtle that comes up instead; the APB renders the clause, “instead of the nettle shall come up the myrtle.”

   Isaiah 55:13

In the Anselm Project Bible: In Isaiah 55:13 the APB presents the term as “nettle” in the contrast with the myrtle.