plural of billionth

(computing, informal) A computer other than a Macintosh that has been configured to run the Macintosh operating system (OS X or macOS).

(biochemistry) Initialism of high-density lipoprotein. / (electronics) Initialism of hardware description language.

(rare, potentially derogatory, offensive) A person with very pale skin, most likely of Caucasian origin, who is predisposed to developing skin cancer.