diffuse (v.) Look up diffuse at Dictionary.com
1520s (transitive), 1650s (intransitive), from Latin diffusus, past participle of diffundere "to pour out or away," from dis- "apart, in every direction" (see dis-) + fundere "to pour" (from nasalized form of PIE root *gheu- "to pour"). Related: Diffused; diffusing.
diffuse (adj.) Look up diffuse at Dictionary.com
early 15c., from Latin diffusus, past participle of diffundere "scatter, pour out," from dis- "apart, in every direction" (see dis-) + fundere "to pour" (from nasalized form of PIE root *gheu- "to pour").