umbrella:1

noun
um*brel*la \ ˌəm-ˈbre-lə \ ˈəm-ˌbre- \
1611{ds||1||}
  • a collapsible shade for protection against weather consisting of fabric stretched over hinged ribs radiating from a central pole; especially : a small one for carrying in the hand
  • something which covers or embraces a broad range of elements or factors
  • the bell-shaped or saucer-shaped largely gelatinous structure that forms the chief part of the body of most jellyfishes : bell

umbrella:2

verb
umbrella \
1834
  • to protect, cover, or provide with an umbrella

umbrella plant

noun
umbrella plant \
circa 1909
  • a perennial sedge (Cyperus alternifolius) of Madagascar that has large terminal whorls of slender leaves and is often grown as an ornamental

umbrella tree

noun
umbrella tree \
circa 1790
  • any of various trees or shrubs resembling an umbrella especially in the arrangement of leaves or the shape of the crown; especially : either of two widely cultivated trees (Heptapleurum arboricola and H. actinophyllum) of Australia and New Guinea having leaflets radiating from an elongate petiole
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