Definitions

1. noun

relating to or resembling an aphtha (a small, usually painful sore on the mucous membrane, especially of the mouth)

“The dentist was concerned that the aphthoid sores on the child’s tongue were a sign of a more serious condition.”

2. adjective

having or characterized by aphthae (small, usually painful sores on the mucous membrane)

“The patient’s aphthoid ulcers were a common symptom of the autoimmune disorder.”