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- Serpukhovian
- Serranidae
- Serranus cabrilla
- Serrasalmus rhombeus
- serrate
- serrated wrack
- Serravallian
- Serres De Mesplès, Marcel Pierre Toussaint De
- Serres, Antoine Étienne Reynaud Augustin
- Serres, Olivier De (or Des)
- Serret, Joseph Alfred
- Serrivomeridae
- serrulate
- Sertoli, Enrico
- Sertürner, Friedrich Wilhelm Adam Ferdinand
- Serullas, Georges-Simon
- Servois, François-Joseph
- Sesamum indicum
- Sesiidae
- sesquioxides