/ Dictionary / Index D diffuse-porous: Meaning and Definition of Find definitions for: dif•fuse-po•rous Pronunciation: (di-fys"pôr'us, -pōr'-), [key] — adj. Bot. having annual rings in which the size of pores is approximately the same in wood formed in spring and summer. Cf. ring-porous. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. diffuse nebula diffuser Related Content Daily Word Quiz: dormant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language