Yes, adnexa is a Scrabble word!
...and is worth 14 points in Scrabble, and 15 points in Words with Friends
adnexa
Noun
1. Accessory or adjoining anatomical parts or appendages to an organ (especially of the embryo)
What Scrabble words can I make with the letters in adnexa?
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Words that can be created with an extra letter added to adnexa:
L:adnexal