noun

• (physics, astronomy) Any frozen volatile chemical, such as ammonia or carbon dioxide.
• (astronomy) Any volatile chemical, such as water, ammonia, or carbon dioxide, not necessarily in solid form, when discussing the composition of e.g. a planet as an ice giant vs a gas giant.
  "Above the core is the lower-density liquid mantle composed of ice materials under high pressure and temperature. This massive liquid layer would not be separated into layers of traditional ice compounds, but mixtures of radically different compounds originally consisting of water, carbon dioxide, methane, and ammonia […] Since the mass of the planet is dominated by the liquid mantle that itself consists of heated ices under pressure, both Uranus and Neptune are classified as giant ice planets."
• (figuratively) Something having an extreme coldness of manner.
  "a heart of ice"
• (figuratively) Something, such as awkwardness, that prevents open social interaction.
  "The dialogues—or "raps"—usually take place on a monthly or bi-monthly basis and aim at fostering contacts hand at breaking through stereotypical notions held by both sides. "There's no question that there's ice to begin with," said Lance Bradley, who conducts the raps for Chelsea's Tenth Precinct."

verb

• (intransitive) To become ice; to freeze.
• (transitive) To cool with ice, as an injured body part or a beverage.
  "To treat runner's knee, you need to rest from running or any other high-impact activity, ice the knee, and strengthen the quadriceps through weight training."
• (transitive) To make icy; to freeze.
  "The bridge ices before the road."
• (transitive) To cover with icing (frosting made of sugar and milk or white of egg); to frost; as cakes, tarts, etc.

name

• (sports) Abbreviation of Iceland.
• (government, US) Acronym of Immigration and Customs Enforcement (“law-enforcement agency responsible for immigration and customs matters of the United States Federal government”).
  "Mr. Schlossberg’s rant angered activists for immigrant rights, who said it reinforced stereotypes that Spanish speakers are not citizens. And they worried that it perpetuated fear within immigrant communities of ICE’s aggressive tactics to deport those who are undocumented."
• (rail transport) Initialism of Intercity-Express (“German high speed train”).

noun

• (automotive) Acronym of internal combustion engine.
  "“ICE-ing is EV owner-speak for when an internal combustion engine (ICE) car blocks or parks in a charging point space. On EV internet forums, stories of drivers being ICEd abound. But rather than scuffles breaking out, if stories are to be believed, British EV drivers resort to leaving notes and icy stares when the offending ICE driver returns."
• (programming) Initialism of internal compiler error.
• (computing) Initialism of in-circuit emulator/emulation.
• (automotive) Initialism of in-car entertainment.