Brunneous is an adjective that means dark brown. 

Our word of the day comes almost directly from the Latin word brunneus (broo NAY oose) which means ‘brown.’ Here’s an example of brunneous in use:

The brunneous color of the trees is very different from my surroundings during the week. It would be nice to have that shade when I wake up each day, but it would take forever to paint all the concrete and steel brown.