cupule

Etymology

cup + -ule

noun

  1. Any small structure shaped like a cup, such as at the base of an acorn, or the sucker on the feet of some flies.
    Then they extract a three-angled beechnut from its cupule, weigh it, and push it into the loam. 2018, Richard Powers, The Overstory, Vintage (2019), page 146

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