Yes, tang is a Scrabble word!

Noun

1. A tart spicy quality

2. The imperial dynasty of China from 618 to 907

3. The taste experience when a savoury condiment is taken into the mouth

4. A common rockweed used in preparing kelp and as manure

5. Brown algae seaweed with serrated edges

6. Any of various coarse seaweeds

7. Any of various kelps especially of the genus Laminaria