Boyd’s Bible Dictionary:
(adherer). Found in stagnant waters of East, and fastens to nostrils of animals when drinking (Prov. 30:15).
Concise Bible Dictionary:
Leeches are abundant in Palestine, and the horseleech may simply refer to a large species that would settle on a horse’s foot if placed in the water where they abound. A horse has been known, in drinking, to get a leech into its mouth, which immediately began to suck its blood. The leech is used symbolically of a rapacious person, who is never satisfied, graphically delineated by the leech’s two daughters, who say, “Give, give” (Prov. 30:15).
Strong’s Dictionary of Hebrew Words:
Transliteration:
`aluwqah
Meaning:
feminine passive participle of an unused root meaning to suck; the leech