Full of pores.
From M.Fr. poreux, from M.L. porosus, from L. porus "opening," → pore.
porous dust grain
dâne-ye qobâr-e porlik
Fr.: grain de poussière poreux
A type of → interstellar dust grain made up of an aggregate of components with a hollow structure. Various processes operating in interstellar and → circumstellar media are believed to produce inhomogeneous and porous dust grains. Porous grains can produce more → extinction per unit mass than their combined individual dust components. They are generally cooler than compact grains (see, e.g., Iati et al. 2001, MNRAS 322, 749).