Definition of HTML in US English:

HTML

noun

Computing
  • Hypertext Markup Language, a standardized system for tagging text files to achieve font, color, graphic, and hyperlink effects on World Wide Web pages.

Pronunciation

HTML

/ˌāCH ˌtē ˌem ˈel//ˌeɪtʃ ˌti ˌɛm ˈɛl/