1.
A ~ substance has been made pure by having other substances removed from it.
...~ sugar.
ADJ: usu ADJ n
2.
If you say that someone is ~, you mean that they are very polite and have good manners and good taste.
...~ and well-dressed ladies...
= genteel
ADJ
3.
If you describe a machine or a process as ~, you mean that it has been carefully developed and is therefore very efficient or elegant.
This technique is becoming more ~ and more acceptable all the time.
ADJ