What term describes clay that is dry and very fragile, ready for firing?

The term that describes clay that is dry and very fragile, ready for firing, is indeed "greenware." Greenware refers to the state of clay that has been formed but is still in its unfired state. At this stage, the clay has lost most of its moisture and has become quite fragile, which makes it essential to handle with care before it is placed in a kiln for firing.

Leatherhard is a stage where the clay is still somewhat pliable and can retain its shape, allowing for adjustments or additional sculpting. Bisqueware, on the other hand, refers to clay that has already been fired once, making it more durable and less fragile but not yet glazed. Slip is a liquid mixture of clay and water used for joining pieces of clay together or as a decorative surface, not relevant to the dry and fragile state mentioned in the question.