The definition of asinine is to be silly, stupid or ridiculous. An example of asinine is a foolish prank played on a friend.
In humans, there are twelve thoracic vertebrae and they are intermediate in size between the cervical and lumbar vertebrae; they increase in size going towards the lumbar vertebrae, with the lower ones being a lot larger than the upper.
One of the segments of the vertebral column; in humans, there are usually 33 vertebrae: seven cervical, twelve thoracic, five lumbar, five sacral (fused into one bone, the sacrum), and four coccygeal (fused into one bone, the coccyx).