canna /ˈkænə/noun 3contraction 1forms 1 noun3 •Any member of the genus Canna of tropical plants with large leaves and often showy flowers.A palisade of Canary palms formed an honour guard along the verges, while beds of golden cannas flamed from the central reservation. — 2000 •[in compounds] (slang) Clipping of cannabis.No high holiday is complete without an appropriate spread of canna-accessories—and we’re talking about more than just a glasstastic collection of pipes and bowls. — 2022 •(historical) A measure of length in Italy, varying from six to seven feet. contraction1 •(Scotland) Contraction of can + not: cannot.I canna' change the laws of physics. — 1966 formscannas