Hypertext Webster Gateway: "concertina"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Concertina \Con`cer*ti"na\, n. [From It. concerto a concert.]
A small musical instrument on the principle of the accordion.
It is a small elastic box, or bellows, having free reeds on
the inside, and keys and handles on the outside of each of
the two hexagonal heads.
From WordNet (r) 1.7 (wn)
concertina
n 1: coiled barbed wire used as an obstacle
2: free-reed instrument played like an accordion by pushing its
ends together to force air through the reeds
v : collapse like a concertina
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