primary syphilis

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. The first stage of syphilis, characterized by formation of a painless chancre at the point of infection and hardening and swelling of adjacent lymph nodes.

GNU Webster's 1913

1. adj. (Med.) the initial stage of syphilis, including the period from the development of the original lesion or chancre to the first manifestation of symptoms indicative of general constitutional infection.

WordNet 3.0

1. n. the first stage; characterized by a chancre at the site of infection