Lewis & Short

mĕābĭlis, e, adj. [meo].

  1. * I. Pass., passable, that can be passed through: transitus vel bubus meabilis, Plin. 6, 1, 1, § 2.
  2. * II. Act., passing through, penetrating: aër per cuncta rerum meabilis, Plin. 2, 5, 4, § 10.