Definition: An infectious, painful, ragged venereal ulcer at the site of infection by Haemophilus ducreyi, beginning after an incubation period of 3–7 days; seen more commonly in men; gram-negative streptobacilli may be identified by staining material from the ulcer.
[chancre + G. eidos, resemblance]
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Examples: glitazone, GI cocktail, etc.