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[pawr-uh s, pohr-] /ˈpɔr əs, ˈpoʊr-/

full of .
permeable by water, air, etc.
permeable to water, air, or other fluids
(biology, geology) having pores; poriferous
easy to cross or penetrate: the porous border into Thailand, the most porous defence in the league

late 14c., “full of pores,” from Old French poros (14c., Modern French poreux), from Medieval Latin porosus; or directly from Latin porus “an opening” (see pore (n.)). Figurative use from 1640s.

porous po·rous (pôr’əs)

po’rous·ness n.
Having many pores or other small spaces that can hold a gas or liquid or allow it to pass through.


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  • Porphyrin

    [pawr-fuh-rin] /ˈpɔr fə rɪn/ noun, Biochemistry. 1. a dark red, photosensitive pigment consisting of four pyrrole rings linked by single carbon atoms: a component of chlorophyll, heme, and vitamin B 1 2 . /ˈpɔːfɪrɪn/ noun 1. any of a group of pigments occurring widely in animal and plant tissues and having a heterocyclic structure formed […]

  • Porphyrinogen

    porphyrinogen por·phy·rin·o·gen (pôr’fə-rĭn’ə-jən, -jěn’) n. Any of the intermediates in the biosynthesis of heme.

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