noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   Alopecurus myosuroides, a weed that harms wheat crops. UK, uncountable
2. 2
   Juncus gerardii, a salt marsh plant used for facing dikes. US, uncountable

Etymology

From black + grass.

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