HST Definition

abbreviation
Hawaiian-Aleutian Standard Time.
Webster's New World
Hypersonic transport.
American Heritage
Hawaiian Standard Time.
Wiktionary

(Canada) Harmonized Sales Tax, a combined federal and provincial sales tax collected in some provinces.

Wiktionary
(space science, US, NASA) Initialism of Hubble Space Telescope.
Wiktionary

Words Near HST in the Dictionary