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plural vela or velums
a thin membrane resembling a veil or curtain, such as:
(anatomy) the soft palate examples
(botany) a thin membrane partially covering the cluster of sporangia near the leaf base in quillworts and their extinct relatives examples
(mycology) 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
(malacology) a locomotory and feeding organ provided with cilia found in the larval stage of bivalves
(zoology) a annular membrane, typically bordering a cavity, especially in certain molluscs, medusae, and other invertebrates
a delicate membrane found on certain protists examples
(meteorology) an accessory cloud resembling a veil extending over a large distance; normally associated with cumulus and cumulonimbus