keel
Transom - is the member forming the backend of a boat. The back of a boat is known as the stern. ~Larry Merritt, Coconut Creek, FL (and avid kayaker).
back bone spine
The individual bones of the spine are called Hyoid.
a spine doctor.
That they have hurt their spine
The spine of a book is called the backbone. It is the part of the book that faces outward when placed on a shelf and typically displays the title, author, and publisher.
keel - the chief timber or steel element extending along the entire length of the bottom of a boat or ship and supporting the frame. It is also called the backbone of a ship.
your spine
It is called the spine>
Spine
spine
depends on what part of the spine you are talking about. Generally any enlargement is called hypertrophy.