‖prop. n. [ NL., dim. of L. margo, marginis, a margin. ] (Zool.) A genus of small, polished, marine univalve shells, native of all warm seas. [ 1913 Webster ]
adv. 1. In the margin of a book. [ 1913 Webster ]
2. In a marginal{ 3 } manner; barely sufficiently; almost not; as, marginally useful. [ PJC ]