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; Dan. 4:12, 14, 21; Mark 11:13; 13:28). The fresh leaf is a symbol of prosperity (Psalm 1:3; Jeremiah 17:8; Ezek. 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.

Noah Webster's New International Dictionary of the English Language

1. (n.) A colored, usually green, expansion growing from the side of a stem or rootstock, in which the sap for the use of the plant is elaborated under the influence of light; one of the parts of a plant which collectively constitute its foliage.

2. (n.) A special organ of vegetation in the form of a lateral outgrowth from the stem, whether appearing as a part of the foliage, or as a cotyledon, a scale, a bract, a spine, or a tendril.

3. (n.) Something which is like a leaf in being wide and thin and having a flat surface, or in being attached to a larger body by one edge or end; as : (a) A part of a book or folded sheet containing two pages upon its opposite sides. (b) A side, division, or part, that slides or is hinged, as of window shutters, folding doors, etc. (c) The movable side of a table. (d) A very thin plate; as, gold leaf. (e) A portion of fat lying in a separate fold or layer. (f) One of the teeth of a pinion, especially when small.

4. (v. i.) To shoot out leaves; to produce leaves; to leave; as, the trees leaf in May.