Yes, glad is a Scrabble word!
...and is worth 6 points in Scrabble, and 8 points in Words with Friends
glad
Adjective
1. Showing or causing joy and pleasure; especially made happy
2. Eagerly disposed to act or to be of service
3. Feeling happy appreciation
4. Cheerful and bright
Noun
1. Any of numerous plants of the genus Gladiolus native chiefly to tropical and South Africa having sword-shaped leaves and one-sided spikes of brightly colored funnel-shaped flowers; widely cultivated
What Scrabble words can I make with the letters in glad?
3 Letter Words
2 Letter Words