1748, Modern Latin (Frederick Ruysch), from Greek epi "upon" (see epi-) + thēlē "teat, nipple," from suffixed form of PIE root *dhe(i)- "to suck." Related: Epithelial.
epistle
epistolary
epistrophe
epitaph
epithalamium
epithelium
epithet
epitome
epitomise
epitomize
epizoic