Ol·do·wan 
(ōldə-wən, ôl-)
(ōldə-wən, ôl-)adj.
Of or relating to an early stage of African Paleolithic tool culture characterized by choppers and bifacial chopping tools.
[After the Oldoway (Olduvai) Gorge.]
- counterargument
- counterattack
- counterbalance
- counterblow
- counterchange
- countercharge
- counter check
- countercheck
- counterclaim
- counterclaimant
- counterclockwise
- counterconditioning
- countercoup
- countercultural
- counterculture
- counterculturist
- countercurrent
- countercurrently
- countercyclical
- counterdemonstration
- counterdemonstrator
- counterespionage
- counterexample
- counterfactual
- counterfeit