Boyd’s Bible Dictionary:
(pitch). Disputed rendering. Probably plane-tree is meant (Isa. 41:19; 60:13).
Concise Bible Dictionary:
1. tidhar. A tree that grew on Mount Lebanon, but of what sort is uncertain (Isa. 41:19; Isa. 60:13).
2. ets shemen, “trees of oil” (Neh. 8:15). See OIL TREE.