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Radiology (branch of medicine)
Radish (plant, vegetable)
Radium (metal, 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)
Reciprocating aircraft engine (aeronautical engineering)
Recombination (in genetics)
Rectifier (mechanical device)
Rectilinear motion (classical mechanics)
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