1.  mimosa(n = noun.plant) acacia dealbata, silver wattle - evergreen Australasian tree having white or silvery bark and young leaves and yellow flowers;
is a kind of wattle
is a member of genus acacia

2.  mimosa(n = noun.plant) - any of various tropical shrubs or trees of the genus Mimosa having usually yellow flowers and compound leaves;
is a kind of bush, shrub
is a member of genus mimosa
has particulars: mimosa sensitiva, sensitive plant, action plant, humble plant, live-and-die, mimosa pudica, sensitive plant, shame plant, touch-me-not

3.  mimosa(n = noun.food) buck's fizz - a mixed drink containing champagne and orange juice;
is a kind of mixed drink

   A genus of leguminous plants, containing many species, and including the sensitive plants (Mimosa sensitiva, and Mimosa pudica). [1913 Webster]
" The term mimosa is also applied in commerce to several kinds bark imported from Australia, and used in tanning; -- called also wattle bark." Tomlinson. [1913 Webster]

mimosa, n.
1 any leguminous shrub of the genus Mimosa, esp. M. pudica, having globular usu. yellow flowers and sensitive leaflets which droop when touched.
2 any of various acacia plants with showy yellow flowers.

Etymology:
mod.L, app. f. L (as MIME, from being as sensitive as animals) + -osa fem. suffix

genus mimosa, mimosa bush, mimosa pudica, mimosa sensitiva, prairie mimosa