tusk
(geology) A smooth, striated rock surface caused by the friction of one mass sliding over another
One of a pair of elongated pointed teeth that extend outside the mouth of an animal such as walrus, elephant or wild boar, and which continue to grow throughout the animal's life.
plural of protofilament
plural of runcation
その象は干ばつのとき、水を掘るために長い象牙を使った。
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