VELUM

velum

Noun

  1. A thin membrane, resembling a veil, such as:
    1. The soft palate.
    2. A thin membrane partially covering the cluster of sporangia near the leaf base in quillworts and their extinct relatives.
    3. A veil-like membrane of immature mushrooms extending from the margin of the cap to the stem and is torn by growth, to reveal the gills.
    4. A locomotory and feeding organ provided with cilia found in the larval stage of bivalves.
    5. A circular membrane round the cap of medusa.
    6. A delicate membrane found on certain protists.
  2. An accessory cloud resembling a veil extending over a large distance. Normally associated with cumulus and cumulonimbus.


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