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Radiology (branch of medicine)
Radish (plant, vegetable)
Radium (element)
Radon (element)
Railroad engineering (transportation engineering)
Rainbow (in meteorology)
Ramie (herb)
Random matrices (theoretical physics)
Rape (in botany)
Raphidpophyceae (algae)
Rare-earth elements (metal)
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Rarefied gas flow (fluid mechanics)
Raspberry (plant, fruit)
Rat (African mythology)
Rate-of-climb indicator (aeronautical engineering)
Ratites (aves)
Reaction turbine (mechanical engineering)
Reactor (electrical engineering)
Reactor physics (nuclear engineering)
Reagent chemicals (analytical chemistry)
Real variable (analysis)
Real-time systems (technology)
Reciprocating aircraft engine (aeronautical engineering)
Recombination (in genetics)
Rectifier (mechanical device)
Rectilinear motion (classical mechanics)
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