1. Pertaining to, or caused by, aphthae; characterized by aphthae
   "aphthous ulcers"

Encyclopedia: Aphthous

• genus Sardinia
• genus Sardinops
• genus Sargassum
• genus Sarracenia
• genus Sassafras
• genus Satureia
• genus Satureja
• genus Saturnia
• genus Sauromalus
• genus Saurosuchus
• genus Saururus
• genus Saussurea
• genus Saxegothea
• genus Saxicola
• genus Saxifraga
• genus Sayornis
• genus Scabiosa
• genus Scaphiopus
• genus Scaphosepalum
• genus Scarabaeus
• genus Scardinius
• genus Scartella
• genus Sceliphron
• genus Sceloglaux
• genus Sceloporus