1. droppable - Noun
2. droppable - Adjective
droppable (not comparable)
Capable of being dropped (especially by an aircraft).
droppable (plural droppables)
(graphical user interface) A component onto which the user can drag other items; a drop target.
The event will still bubble normally, but the can be checked to see which droppable received the draggable element. Source: Internet
If a card is to be dragged within the same swim lane, only a droppable target cell is added to the dotted line border. Source: Internet