Monocot leaves have veins that are parallel, have leaves that are in groups of three, have one cotyledon and have scattered vascular bundles. They are one type of a leaf with the majority of other leaves being dicot leaves.
The name monocot essentially stems from the amount of cotyledons that are present in the leaf. The Latin term "mono" means one, which is why the monocot only has one cotyledon. In Latin, the prefix "di" means many and the dicot leaves always have more than one cotyledon in them.
While a cotyledon is the distinguishing factor in whether a leaf is a monocot or a dicot, it is important to understand what a cotyledon actually is. The cotyledon is a seed leaf. It is the primary leaf that has seeds in it and the one that creates the embryo for new plants. Dicots have many leaves that can turn into new plants while monocots only have one of these leaves that is able to be the basis for a new leaf.
The most common example of a monocot leaf is a blade of grass. Cornhusks, rice, coconut, tulips and onions are all examples of monocot leaves. These are the most common type of monocots, but there are many more monocots that are more exotic and less common. The dicot leaf is a more popular type of leaf and can be found on maple trees, roses and sunflowers.