Pronounced as: nay-deer
Definition: (n) 1: the point on the celestial sphere that is directly opposite the zenith and vertically downward from the observer; 2: the lowest point
Synonyms: bedrock, bottom, depth, zero
Antonyms: apex, crown, culmination, height, summit
I found this in the humorous account of author John Connelly of his experience on Atria's Great Mystery Bus Tour in The Writer's Life section of the Shelf Awareness For Readers Newsletter on April 27, 2012. If you aren't already following the Shelf Awareness newsletter, you should for news on the book trade and new books being released. Plus they have a great section called Book Candy that features some pretty interesting products involving books.
The newly implanted optical piece showed her the nadir of the crevice. However, it didn't show her the hand that pushed her in.
Your turn: Show me in the comments how you might use this word in your own writing. As an added challenge, try your hand at a piece of hint fiction (a piece of fiction in 25 words our less that hints to something bigger).