maize
A tall grain plant with yellow kernels, also called corn.
Maize is what most of the world calls the tall grain plant that Americans know as corn. The word comes from an Indigenous Caribbean language, and it's the term scientists, farmers, and people in many countries use when talking about this important crop.
When you see “corn” in an American grocery store, that same plant is called maize almost everywhere else. In Britain, “corn” traditionally meant wheat, so they kept using maize to avoid confusion. Scientists use maize in research papers because it's the precise, universal term, like how doctors say “cardiac” instead of “heart-related.”
Maize was first domesticated by Indigenous peoples in Mexico thousands of years ago, starting from a wild grass that looked nothing like today's tall stalks with fat ears of kernels. Through careful selection over many generations, they transformed it into one of humanity's most important crops. Today, maize feeds billions of people and livestock worldwide. It's ground into flour for tortillas and cornbread, popped into popcorn, and processed into countless products, from breakfast cereal to fuel.
So while Americans typically say corn, remember that when you hear maize, it's the same golden grain on the cob, just wearing its more formal, international name.