A wild oat or type of grass similar to oat plants; a weed that resembles oat grain.
Compound of 'haver' (oats) and 'grass.' The term appears in agricultural contexts to describe wild oat species that grow in grain fields.
Havergrass was the farming curse of medieval Britain—it grew in the same fields as cultivated oats and was nearly impossible to separate, so farmers regularly ate 'weeds' with their grain without realizing it.
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