Monocotyledon
/ˌmɑːnəʊˌkɑːtɪˈliːdn/
Definition 1 of 1
Pro Tip 1/3Seed Leaf
Monocotyledon refers to the single leaf in a seedling, not multiple leaves. 
Lilies are monocotyledons because they have just one seed leaf.
Pro Tip 2/3Plant Identification
Use 'monocotyledon' to identify and categorize plants in science and gardening. 
In our botany class, we learned how to distinguish monocotyledons from other plants.
Pro Tip 3/3Technical Term
'Monocotyledon' is a technical term used in botany, may be unfamiliar in casual conversation. 
I was surprised that my uncle knew the term 'monocotyledon' since he's not a botanist.