Of a tree. The olive-leaf mentioned Genesis 8:11. The barren fig-tree had nothing but leaves (Matthew 21:19; Mark 11:13). The oak-leaf is mentioned Isaiah 1:30; 6:13. There are numerous allusions to leaves, their flourishing, their decay, and their restoration (Leviticus 26:36; Isaiah 34:4; Jeremiah 8:13; Daniel 4:12,14,21; Mark 11:13; 13:28). The fresh leaf is a symbol of prosperity (Psalms 1:3; Jeremiah 17:8; Ezekiel 47:12); the faded, of decay (Job 13:25; Isaiah 1:30; 64:6; Jeremiah 8:13).
Leaf of a door (1 Kings 6:34), the valve of a folding door.
Leaf of a book (Jeremiah 36:23), perhaps a fold of a roll.
These dictionary topics are from M.G. Easton M.A., D.D., Illustrated Bible Dictionary, Third Edition, published by Thomas Nelson, 1897. Public Domain, copy freely.
Easton, Matthew George. "Entry for 'Leaf'". "Easton's Bible Dictionary".