Yes, radian is a Scrabble word!

...and is worth 7 points in Scrabble, and 8 points in Words with Friends

radian

Noun

1. The unit of plane angle adopted under the Systeme International d'Unites; equal to the angle at the center of a circle subtended by an arc equal in length to the radius (approximately 57.295 degrees)

What Scrabble words can I make with the letters in radian?

5 Letter Words

dinar
drain
nadir
naiad
naira
ranid

4 Letter Words

airn
aria
arid
nada
nard
raia
raid
rain
rand
rani
rind

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Words that can be created with an extra letter added to radian:

S:radiansE:araneidL:laniardnadiralT:radiant