dragonfly(Any of the insects composing six families of the suborder Anisoptera and having four large, membranous wings and compound eyes that provide keen vision)
drainage(1. Removal of groundwater or surface water, or of water from structures, by gravity or pumping. 2. The discharge of water from a soil by percolation (the process by which surface water moves downwards through cracks, joints and pores in soil and rocks))