Definition of velum
1
: a membrane or membranous part resembling a veil or curtain: such as
a
: soft palate
b
: an annular membrane projecting inward from the margin of the bell in some jellyfishes (such as the hydromedusae)
2
: a swimming organ that is especially well developed in the later larval stages of many marine gastropods
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Merriam-Webster unabridged
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Time Traveler for velum
The first known use of velum was in 1753
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