TEA has released an Interactive Math Glossary app for both iOS and Android. This app is meant for K-8 math vocabulary terms that teachers and students can see the definition and examples of what the term is describing. All vocabulary is used in the TEKS.
To download for iOS devices, go to https://itunes.apple.com/us/app/interactive-math-glossary/id1051404376?mt=8. To download for Android devices, go to https://play.google.com/store/apps/details?id=gov.texas.tea.math.glossary&hl=en.