a. [f. mod.L. velamentum: cf. prec. and L. vēlāmenta pl.] Of the nature of a membrane or membranous covering.

1

1891.  Cent. Dict., s.v., The velamentous arms of the nautilus.

2

1902.  Brit. Med. Jrnl., 29 March, 773. Velamentous insertion of the cord.

3