Definition of Japanese walnut
: a valuable Japanese nut tree (Juglans cordiformis ailanthifolia) that bears a heart-shaped nut and is used as a walnut stock because of its hardiness
— called also heartnut, Japan walnut
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“Japanese walnut.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Japanese%20walnut. Accessed 25 Feb. 2021.
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