Velum

Definition and stakes

Portrait of William Smith William Smith,  A Smaller Dictionary of Greek and Roman Antiquities

“ VĒLĀRĬUM. [Amphitheatrum, p. 23.]
VĒLĬTES, the light-armed troops in a Roman army. [Exercitus, p. 169.]
VĒLUM (αὐλαία) .— (1) A curtain. Curtains were used in private houses as coverings over doors, or they served in the interior of the house as substitutes for doors.— (2) Velum, and more commonly its derivative velamen, denoted the veil worn by women. That worn by a bride was specifically called flammeum. [Matrimonium.] — (3) (Ἱστίον.) A sail. [Navis, p. 267.]
VĒNĀBŬLUM, a hunting-spear. This may have been distinguished from the spears used in warfare by being barbed
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Source: Gutenberg

Joseph Thomas Cunningham,  1911 Encyclopædia Britannica (1911)

“ The preconchylian invagination or shell-gland is formed in the embryo behind the velum, on the surface opposite the blastopore. It is surrounded by a ridge of cells which gradually extends over the visceral sac and secretes the shell. In forms which are naked in the adult state, the shell falls off soon after the reduction of the velum, but in Cenia, Runcina and Vaginula the shell-gland and shell are not developed, and the young animal when hatched has already the naked form of the adult. ”
Source: Wikisource

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