Tuna \Tu"na\, n. (Bot.) The Opuntia Tuna. See Prickly pear, under Prickly.
Source: Webster's Revised Unabridged Dictionary (1913)
Tuna \Tu"na\, n. [Cf. Tunny.] (Zo["o]l.) (a) The tunny. (b) The bonito, 2.