そくど
velocity, speed
How fast by how much, which is a number rather than an impression. So そく quick, and by how much ど. What does the Shinkansen actually do: そくど.
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Emaki is not affiliated with, or endorsed by, Kaishi 1.5k or its authors. The word, reading and meaning come from the Kaishi 1.5k deck, used with their permission. The mnemonic, the note and the kanji breakdown are original work, published under CC BY-SA 4.0.