insular script noun1 •A medieval script originating in 7ᵗʰ-century Ireland, derived from the semi-uncial and the New Roman cursive scriptsIn Ammian. ⅹⅹ. 3. 1 secuturos thecanno VM: for secuto post haec anno; the original error must have been secutoros, with the confusion of P and R common in reading the insular script. — 1913 formsinsular scripts