gnat

Boyd’s Bible Dictionary:

A small insect; figuratively mentioned

Concise Bible Dictionary:

 
Eye Gnat
The word κώνωψ, is supposed to refer to any species of gnat or mosquito. Matthew 23:2424Ye blind guides, which strain at a gnat, and swallow a camel. (Matthew 23:24) should read “strain out” in contrast to “swallowing.”

Strong’s Dictionary of Greek Words:

Number:
2971 (find all occurrences in KJV Bible)
Greek:
κώνωψ
Transliteration:
konops
Phonic:
ko’-nopes
Meaning:
apparently a derivative of the base of 2759 and a derivative of 3700; a mosquito (from its stinging proboscis)
KJV Usage:
gnat