Yes, nidus is a Scrabble word!
...and is worth 6 points in Scrabble, and 8 points in Words with Friends
nidus
Noun
1. A central point or locus of an infection in an organism
2. A nest in which spiders or insects deposit their eggs
What Scrabble words can I make with the letters in nidus?
4 Letter Words
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3 Letter Words
2 Letter Words