arp

exclamation1

1. •
   The bark of a seal.

   • All through the prayer he made little arp! arp! noises like a baby seal. — 2001

noun2

1. •
   (informal) An arpeggio.
2. •
   (informal) An arpeggiator.

   • "The arp can be applied to instruments by inserting it as a MIDI effect before your synth of choice." — 2014

noun2

1. •
   (UK, old-fashioned) Initialism of Air Raid Precautions.
2. •
   Initialism of absolute refractory period.