- res
- raffinose
- renouncing (the use of) arms
- regional integration
- reachability matrix
- rightward
- recursive relation
- reprocessed
- renal disorder
- rub salt into wounds
- recirculation
- respiratory movement
- rectilinear
- recto_vaginal septum
- rheumatic mitral stenosis
- relative command
- reinvest
- ripple counter
- richard the lion_hearted
- richard ii
- richard the lionheart
- roadworks
- roadworthy
- rapid access memory
- recessivity
- random data
- red_bellied terrapin
- red_bellied turtle
- robert mills
- ring_a_rosy
- riehls melanosis
- revised standard version
- reverse capstan
- reverse channel
- rh. negative
- residual effect of manure
- retrosubicular area
- roger sessions
- robert edwin peary
- rippling process
- reticular system
- rootlet
- renal acidosis
- remote control unit
- remote call forwarding
- rhodophyceae
- reduced sample
- row of bricks
- resting endplate potential
- rotational latency