Ne·o·gene 
(nēō-jēn′)
(nēō-jēn′)n.
The youngest of two subdivisions of the Tertiary Period, from 23 to 2.6 million years ago, including the Miocene and Pliocene Epochs.
[German Neogen : neo-, neo- + -gen, -gene.]
- rubricate
- rubrication
- rubricator
- rubrician
- rub shoulders
- rub (someone's) nose in
- rub someone's nose in
- rub (someone) the wrong way
- rub someone the wrong way
- rub the wrong way
- rub up on
- ruby
- ruby laser
- ruby-throated hummingbird
- ruche
- ruched
- ruching
- ruck
- ruck
- rucksack
- ruckus
- ruction
- rudd
- rudder
- rudderless