Fes*toon" (?), n. [F. feston (cf. Sp. feston, It. festone), prob. fr. L. festum festival. See Feast.] 1. A garland or wreath hanging in a depending curve, used in decoration for festivals, etc.; anything arranged in this way.

2. (Arch. & Sculp.) A carved ornament consisting of flowers, and leaves, intermixed or twisted together, wound with a ribbon, and hanging or depending in a natural curve. See Illust. of Bucranium.

Fes*toon", v. t. [imp. & p. p. Festooned (?); p. pr. & vb. n. Festooning.] To form in festoons, or to adorn with festoons.

• an ornament such as a garland or chain which hangs loosely from two tacked spots.
  
• (Astronomy) a cloud on Jupiter that hangs out of its home belt or zone into an adjecent area.
  
• a raised cable with light globes attached.
  
• to hang or make festoons