As an adjective contagious
is of a disease, easily transmitted to others.
As an initialism https is
(internet) hypertext transfer protocol secure (http secure), an encrypted form of information transfer on the internet.
Of a disease, easily transmitted to others.
Of a fashion, laughter, etc., easily passed on to others.
- The flu was so contagious that everybody in town got sick!
Of a person, having a disease that can be transmitted to another person by touch.
- Wearing jeans was a contagious fad at that time.
- They were highly contagious , spreading bacteria to other people.
* (of a disease) catching, infectious
(internet) Hypertext Transfer Protocol Secure (HTTP Secure), an encrypted form of information transfer on the Internet.