Also see definition of "Horseleech" in Word Study
Horseleech
HORSELEECH [smith]
Heb. ?alukah , occurs once only, viz. (Proverbs 30:16) There is little doubt that ?alukah denotes some species of leech, or rather is the generic term for any blood-sucking annelid.
Also see definition of "Horseleech" in Word Study