serpiginous
adjective
ser·pig·i·nous (ˌ)sər-ˈpi-jə-nəs 
: creeping, spreading
especially : healing over in one portion while continuing to advance in another
serpiginous ulcers
serpiginously adverb
Word History
Etymology
Middle English serpiginose, from Medieval Latin serpiginosus, from serpigin-, serpigo creeping skin disease, from Latin serpere to creep
First Known Use
15th century, in the meaning defined above
Medical Definition
serpiginous
adjective
ser·pig·i·nous (ˌ)sər-ˈpij-ə-nəs
: slowly spreading
especially : healing over in one portion while continuing to advance in another
serpiginous ulcer