reci - repa
- reciprocal
- reciprocal action
- reciprocal bearings
- reciprocate
- reciprocating
- reciprocating engine
- reciprocating rod
- reciprocity
- reckon
- reckoning
- reclassification
- recognition
- recognition signal
- recognition silhouettes
- recoil
- recoil buffer
- recoil cylinder
- recoil leader
- recoil stroke
- recommended track
- recommission
- recondition
- reconnaissance
- reconnaissance plane
- reconnaissance ship
- reconnection
- record
- record of service
- recorder
- recording
- recording echo-sounder
- recording hydrometer
- recording hygrometer
- recording pen
- recording thermometer
- recruit
- rectangle
- rectangular
- rectangular coordinates
- rectification
