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tall oat grass

noun
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variants: or tall meadow oat

Definition of tall oat grass

: a perennial Eurasian grass (Arrhenatherum elatius) resembling the oat and introduced into North America for use as forage especially in moist soils

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“Tall oat grass.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/tall%20oat%20grass. Accessed 8 December 2019.

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