Is it ensure, insure, or assure?
large island west of Italy, Latin, from Greek Sardo; perhaps named for the local Iberian people who settled there; the original form and meaning of the name is lost. A Punic (Phoenician) stelle from 7c. B.C.E. refers to it as Shardan. The oblique cases are sometimes Sardonos, etc., as if from *Sardon. Related: Sardinian.