Noah Webster's Dictionary (n.) Fallacious reasoning; deceptive logic; reasoning sound in appearance only.

Multi-Version Concordance Sophistry (2 Occurrences) Galatians 3:1 You foolish Galatians! Whose sophistry has bewitched you--you to whom Jesus Christ has been vividly portrayed as on the Cross? (WEY) Colossians 2:4 I say this to prevent your being misled by any one's plausible sophistry. (WEY)