The word transplant has two main meanings:

1. To move a living thing from one place to another so it can grow in a new location. When gardeners transplant seedlings, they carefully dig them up and replant them where they'll have more room to grow. You might transplant a small tree from a pot into your yard, or transplant tomato plants from an indoor tray to an outdoor garden. The key is that the living thing continues growing in its new home.
2. In medicine, to transfer an organ or tissue from one person's body to another's, or from one part of a body to a different part. A heart transplant gives someone a healthy heart when their own heart is failing. A kidney transplant can save someone whose kidneys have stopped working properly. Doctors might also transplant skin from one area of your body to help heal a severe burn somewhere else. Medical transplants require careful matching and skilled surgeons, and they've saved millions of lives since doctors first figured out how to perform them successfully.

As a noun, a transplant can refer to the organ or tissue itself (“the patient received a kidney transplant”) or to a person who has moved to live somewhere new (“she's a transplant from Boston, now living in Texas”).