n Bot. Family of apetalous dicotyledonous plants. They are mostly herbs (few are shrubs or trees), with alternate or opposite leaves, tiny flowers with persistent calyces, arranged in terminal spikes or capitula, and dry fruits.
This family comprises some 800 species distributed in 60 genera.
Type genus: Amaranthus.
From modern Latin Amaranthaceae; from Amaranthus, name of a plant genus; and the Latin suffix -aceae, «-aceous».