1. Plural of deerfly; small to medium-sized biting flies of the family Tabanidae, related to horseflies, that feed on the blood of mammals including deer and humans.
Usage: Usually plural; singular form is 'deerfly'; Common in warm months near water and wooded areas

Examples

• Deerflies swarmed around us during our hike near the lake.
• The campers were bothered by deerflies throughout the summer evening.
• Deerflies are attracted to movement and dark colors.
• Unlike mosquitoes, deerflies are active during the day.
• We applied insect repellent to protect ourselves from deerflies.