1. a small convex molding cut into the form of a string of beads.
2. a plain convex molding; bead.
3. a molding attached to one or both meeting stiles of a pair of double doors in order to prevent drafts. http://dictionary.reference.com/browse/astragal
"The glazing of the light room was interrupted only by the crisscrossing of the astragals that kept the panes in place."
- M. L. Stedman, The Light Between Oceans (2012)
I'm not convinced that was actually the right word. Maybe it's different in Australian?