Amaranth

n. any of a number of plants having thick green or reddish clusters of flowers; imaginary flower which never dies; reddish-purple color; purple dye

Amaranthus, collectively known as amaranth or pigweed, is a cosmopolitan genus of herbs. Approximately 60 species are presently recognised, with inflorescences and foliage ranging from purple and red to gold. Members of this genus share many characteristics and uses with members of the closely related genus Celosia.
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Noun
1. seed of amaranth plants used as a native cereal in Central and South America
(hypernym) grain, caryopsis
2. any of various plants of the genus Amaranthus having dense plumes of green or red flowers; often cultivated for food
(hypernym) herb, herbaceous plant
(hyponym) tumbleweed, Amaranthus albus, Amaranthus graecizans
(member-holonym) Amaranthus, genus Amaranthus

n. amaranth, any of a number of plants having thick green or reddish clusters of flowers; imaginary flower which never dies; reddish-purple color; purple dye

(n.)
An imaginary flower supposed never to fade.
  

(n.)
A genus of ornamental annual plants (Amaranthus) of many species, with green, purplish, or crimson flowers.
  

(n.)
A color inclining to purple.