tri·on·y·choid \(ˈ)trī|änəˌkȯid\adjective ortry·on·y·choi·de·an\(|)trīˌänə|kȯidēən\ Etymology:trionychoid from New Latin Trionychoidea, order of soft-shelled turtles, from Trionych-, Trionyx + -oidea; trionychoidean from New Latin Trionychoidea + English -an : resembling or related to the Trionychidae