"Introduced by the Romans to England in the 1st and 2nd centuries AD." Is this supposed to mean that the word reached English through Celtic? Because otherwise the note is misleading. Etymology is not about when and how the kiln was introduced to England, but about when and how the word "kiln" was introduced. At first sight, the likelier scenario is that the Saxons borrowed the term on the continent and introduced it to England when they got there.