interpolate
verb (used with object)
to introduce (something additional or extraneous) between other things or parts; interject; interpose; intercalate.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
For," said the interpolater of this line, "did he not know that his brother was giving a banquet?
From The Deipnosophists, or Banquet of the Learned of Athen?us by Athen?us