Velum

Noun

1. A thin membrane resembling a veil or curtain. The soft palate. A thin membrane partially covering the cluster of sporangia near the leaf base in quillworts and their extinct relatives. 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. A locomotory and feeding organ provided with cilia found in the larval stage of bivalves. An annular membrane, typically bordering a cavity, especially in certain molluscs, medusae, and other invertebrates. A delicate membrane found on certain protists.
2. The soft palate.
3. A thin membrane partially covering the cluster of sporangia near the leaf base in quillworts and their extinct relatives.
4. 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.
5. A locomotory and feeding organ provided with cilia found in the larval stage of bivalves.