Ok this is an excellent app. I just want to point out a couple of things in hopes the programmers are listening.
As others have noted, the inability to mark words for later reference is the apps biggest, most glaring weakness. As all language learners know, this is a huge help and a necessary function of a dictionary app that even free basic apps have. Ideally, one should be able to create and name (for organizing by theme or category) multiple lists. Take a clue from Pleco Chinese dictionary, where you can create lists and even several layers of sub-lists. I will happily come back and update to 5 stars when that happens. PLEASE!
All that said, this is a very intelligent and well designed app with lots of thoughtful functions for learners. Makes me excited to study!
Zzzzz about Talking Thai <> English Dictionary+Phrasebook