1. By necessity
   - inescapably, inevitably, unavoidably

See also: ineluctable

• genus Scleroderma
• genus Scleropages
• genus Sclerotinia
• genus Sclerotium
• genus Scolopax
• genus Scolopendrium
• genus Scolymus
• genus Scolytus
• genus Scomber
• genus Scomberesox
• genus Scomberomorus
• genus Scombresox
• genus Scophthalmus
• genus Scopolia
• genus Scorpaena
• genus Scorzonera
• genus Scrophularia
• genus Scutellaria
• genus Scutigera
• genus Scutigerella
• genus Sebastiana
• genus Sebastodes
• genus Secale
• genus Sedum
• genus Seismosaurus