(n.) A neuropterous insect of the genus Ephemera and related genera, of many species, and inhabiting fresh water in the larval state; the ephemeral fly; -- so called because it commonly lives but one day in the winged or adult state. See Ephemeral fly, under Ephemeral.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). dayfly. Retrieved September 20, 2026, from http://smartdefine.org/dayfly/definitions/1994627 |
| Chicago | Webster's. 2011. "dayfly" http://smartdefine.org/dayfly/definitions/1994627 (accessed September 20, 2026). |
| Harvard | Webster's 2011, dayfly, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/dayfly/definitions/1994627>. |
| MLA | Webster's. "dayfly" 27 May 2011. Web. 20 September 2026. <http://smartdefine.org/dayfly/definitions/1994627> |