Hirudinidae
noun plural
Hir·u·din·i·dae
| \ ˌhir-(y)ə-ˈdin-ə-ˌdē
\
\
Medical Definition of Hirudinidae
: a family of aquatic leeches that have 5-ringed segments, 5 pairs of eyes, and usually 3-toothed jaws and that include the common medicinal leech