Haemophilus actinomycetemcomitans

Ac·ti·no·ba·cil·lus ac·ti·no·my·ce·tem·co·m'i·tans

a species of doubtful taxonomic position; frequently associated with some forms of human periodontal disease as well as subacute and chronic endocarditis; occurs with actinomycetes in actinomycotic lesions.

Hae·moph·i·lus ac·tin·o·my·ce·tem·com·i·tans

(hē-mof'i-lŭs ak-tin'ō-mī-sē'tĕm-kom'i-tanz)
A bacterial species of oral cavity flora in humans; frequently associated with human periodontal disease as well as subacute and chronic endocarditis; occurs with actinomycetes in actinomycotic lesions. A member of the HACEK group of organisms (Haemophilus sp., Actinobacillus actinomycetemcomitans, Cardiobacterium hominis, Eikenella corrodens, and Kingella species).