Steiner tree
A floating aquatic plant, Pistia stratiotes, with green rosettes of leaves and inconspicuous flowers. / A plant in the mint family grown for its distinctive circular green calyxes.
Of sixth rank or order. / (arithmetic) Of, pertaining to, or based on six.
(fortification) Obsolete form of palisade.
(graph theory) The minimum-weight connected subgraph of a graph that includes all the vertices of that graph.
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