velum

(anatomy) the soft palate

(botany) a thin membrane partially covering the cluster of sporangia near the leaf base in quillworts and their extinct relatives

(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

(meteorology) an accessory cloud resembling a veil extending over a large distance; normally associated with cumulus and cumulonimbus