noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   Any plant of the genus Astragalus. of milkvetches. countable, uncountable
2. 2
   Certain other plants:; Cobwebby wild indigo (Baptisia arachnifera), an endangered legume native to the United States. countable, uncountable
3. 3
   Certain other plants:; Fremont’s leather flower (Clematis fremontii), a flowering plant in the buttercup family found in the United States. countable, uncountable
4. 4
   Certain other plants:; Rattlepod (Crotalaria retusa), a flowering legume native to tropical Asia, Africa, and Australia. countable, uncountable
5. 5
   Certain other plants:; Desert senna (Senna covesii), a perennial subshrub native to the United States and Mexico. countable, uncountable

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6. 6
   Certain other plants:; Black cohosh (Actaea racemosa) countable, uncountable

Synonyms

All synonyms

false blue indigofalse blue indigolocoweedmilk vetchmilkvetchrattleroot

Etymology

From rattle + weed.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.