Definition of astragal in English:

noun

• 1A moulding or wooden strip of semicircular cross section.

  ‘Of the 286 planes, the majority, were simple moldings like common ogees, astragals, beads, hollows and rounds.’

  ‘Each panel has attached astragal beading with curved comers topped by a beaded and fluted moulded cornice.’

  1. 1.1Architecture A narrow semicircular moulding round the top or bottom of a column.
     ‘A plain astragal ringed the column beneath its plain cap.’
     ‘There is a thick overlapping astragal running round the columns carrying the vaults and arches.’

• 2A bar separating panes of glass in cabinetmaking.