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The Collaborative International Dictionary of English v.0.48:

Horse-leech \Horse"-leech`\, n. 1. (Zool.) A large blood-sucking leech (H[ae]mopsis vorax), of Europe and Northern Africa. It attacks the lips and mouths of horses. [1913 Webster] 2. A farrier; a veterinary surgeon. [1913 Webster]
Easton's 1897 Bible Dictionary:

Horse-leech occurs only in Prov. 30:15 (Heb. 'alukah); the generic name for any blood-sucking annelid. There are various species in the marshes and pools of Palestine. That here referred to, the Hoemopis, is remarkable for the coarseness of its bite, and is therefore not used for medical purposes. They are spoken of in the East with feelings of aversion and horror, because of their propensity to fasten on the tongue and nostrils of horses when they come to drink out of the pools. The medicinal leech (Hirudo medicinalis), besides other species of leeches, are common in the waters of Syria.