noun

• (countable) A loud, sudden sound.
  "One blast upon his bugle horn / Were worth a thousand men."
• (uncountable, broadcasting) Unwanted noise from a microphone.
  "[…] the microphone has been unostentatiously working out its own destiny here and abroad, mainly in America. Evolution seems to be most promising (in the elimination of "microphone blast" and background noises — common faults of the earlier types) in the direction of the electrostatic, or condenser, microphone, […]"
• (figuratively, informal) A good time; an enjoyable moment.
  "We had a blast at the party last night."
• (marketing) A promotional message sent to an entire mailing list.
  "an e-mail blast; a fax blast"

verb

• (transitive) To make an impression on, by making a loud blast or din.
  "Trumpeters, / With brazen din blast you the city's ear."
• (intransitive) To make a loud noise.
• (transitive, informal) To play (music) very loudly out of a speaker.
  "Some kid is in his car blasting rap. You know, bass in the trunk and you can hear it 4 blocks away? I signal over to him and say "Hey, turn it up, I can't hear it." He turns around and says, "Shut Up Grandpa.""
• (transitive) To shatter, as if by an explosion.

intj

• (chiefly British, informal, mildly blasphemous) Used to show anger or disappointment: damn
  "Now, where's my Labour membership card, so I can consider whether to tear it up? Blast, it's plastic..."

noun

• (cytology) An immature or undifferentiated cell (e.g., lymphoblast, myeloblast).