1. In passing
   "touched on it tangentially"

See also: tangential

• family Scyliorhinidae
• family Secotiaceae
• family Selaginellaceae
• family Sepiidae
• family Septobasidiaceae
• family Serranidae
• family Sialidae
• family Sillaginidae
• family Siluridae
• family Simaroubaceae
• family Simuliidae
• family Sirenidae
• family Sisyridae
• family Sittidae
• family Solanaceae
• family Soleidae
• family Solenidae
• family Soricidae
• family Spalacidae
• family Sparganiaceae
• family Sparidae
• family Sphaeriaceae
• family Sphaerobolaceae
• family Sphaerocarpaceae
• family Sphecidae