from The Century Dictionary.
- noun In certain genera of the brachiopods, as Pentamerus and Conchidium, an internal spoon-shaped shelly plate extending from the beak of the ventral valve and serving as a support for the muscles. It is usually connected with the bottom of the valve by a vertical septum.
Sorry, no etymologies found.
It formerly bore grass four feet high, because many umbelliferous plants, such as Heracleum spondylium, Spiraea ulmaria, Laserpitium latifolia, etc., grew in it.