noun ·see veil, ·noun, 3 (b).
2. velum ·noun a veil-like organ or part.
3. velum ·noun a thin membrane surrounding the sporocarps of quillworts isoetes).
4. velum ·noun the circular membrane that partially incloses the space beneath the umbrella of hydroid medusae.
5. velum ·noun a delicate funnel-like membrane around the flagellum of certain infusoria. ·see ·illust. a of protozoa.
6. velum ·noun curtain or covering;
applied to various membranous partitions, especially to the soft palate. ·see under palate.