DictionaryporousLets things through
adjective

porous

POR-us/ˈpɔːrəs/

Allowing things to pass through openings or gaps.

The porous sponge absorbs the trickling water.

A natural sea sponge with many visible holes absorbs a trickle of water.
Etymology

Porous means full of pores, whose Greek name literally meant passages. The small holes are thus understood as routes through a material, explaining why it lets liquid or air through.

In context

Columbia GSAPP29:52
These 3D printed bricks happen to be able to be very porous and absorb water like a sponge
Ronald Rael

More examples

  • The porous border was difficult to monitor.
  • Air moved easily through the porous material.
  • The organization’s porous boundaries allowed ideas to circulate.

Forms

porous · more porous · most porous

porosity noun — the presence of openings that allow passage

Similar words

permeable
Permeable means allowing passage; porous specifically suggests openings or gaps through which passage occurs.
spongy
Spongy describes a soft, absorbent texture; porous material need not be soft.