Etymology of serpent

 The word serpent (reptile, snake) comes from the Old French  sarpent, from the Latin serpentem [nom. serpens; snake], from the v. serpo which is related to the Greek v. herpo / erpo (to creep; Gr: έρπω].
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From the same root: serpentine

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In modern Greek:

a) erpeto: serpent [Gr: ερπετό]

b) serpantina: serpentine [Gr: σερπαντίνα; loanword]
c) erpo: v. to creep [Gr: έρπω].

OED

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