"portable, accordion-like musical instrument," 1835, from concert + fem. ending -ina. Invented 1829 by English inventor Professor Charles Wheatstone (who also invented the stereoscope and the Wheatstone bridge). Concertina wire attested by 1917, so called from similarity to the musical instrument.
conceptually
concern
concerned
concert
concerted
concertina
concerto
concession
concessionaire
concessive
conch