onion couch
noun
A false oat grass of the variety Arrhenatherum elatius var. bulbosum, with bulb-like swollen basal internodes, occurring as a weed of arable land.
Origin
Late 19th century; earliest use found in James Britten (1846–1924), botanist and Roman Catholic propagandist.
- substantiation
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- substate
- substation
- substellar
- substituend