leaf
UK[liːf]US[liːf]
n
a flat, usually green part of a plant that grows from a stem or branch
n
a single sheet of paper in a book, magazine, etc., comprising two pages
n
a very thin sheet of metal, especially gold or silver
v
to produce leaves
Etymology
The word 'leaf' descends directly from the Proto-Germanic laubaz, which carried the core meaning of "foliage" or "that which is peeled or stripped off." This ancient root connects to a deeper Proto-Indo-European base leup-/leubʰ- meaning "to peel, break off," a concept that logically extends to the idea of a thin, detachable layer. Over centuries, this concrete botanical sense was metaphorically applied to other flat, thin objects like pages in a book or sheets of metal. The semantic journey from the action of peeling to the object that is shed or grown captures the word's elegant evolution from a verb-oriented root to a quintessential noun in Modern English.
Analysis
This is a simplex word of Germanic origin. The Old English form was lēaf, which functioned as a noun meaning "leaf of a plant" and also "sheet of paper." It is a cognate with Dutch loof and German Laub.
Examples
The autumn leaf turned a brilliant shade of crimson before falling.
He carefully turned over a new leaf in his life, determined to make better choices.
The ancient manuscript was decorated with delicate gold leaf.