R2-D2
In real, traceable use. Part of the curated seed collection; community review is coming.
Meaning · English
The Phalanx CIWS, an automated gun-based close-in weapon system to defend military watercraft against incoming threats such as aircraft, missiles, and small boats.
Register: slang
Where it’s used:
Used
American English
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).
Common questions
What does “R2-D2” mean?
The Phalanx CIWS, an automated gun-based close-in weapon system to defend military watercraft against incoming threats such as aircraft, missiles, and small boats.
Is “R2-D2” formal or informal?
R2-D2 is generally slang.