Friability is the measure of how friable an object is – meaning how readily it breaks into crumbly pieces or powder. The Merriam-Webster Unabridged Dictionary links the root of these words to that of friction, which clearly lines this concept up with 摩損 [マソン] (also written 磨損) as defined in デジタル大辞泉 via Kotobank.jp, connecting it to the property of friability through friction (“摩擦によって減る”).
As a measure to describe pharmaceutical tablets, 摩損度 and friability are equivalents in pharmacopeias. 日本薬局方 and the U.S. Pharmacopeia define these terms as “摩損度の測定は、錠剤の硬度など他の物理的強度の測定を補足するもの” (p. 1598) and a “measurement of tablet friability supplements other physical strength measurements, such as tablet crushing strength” (p. 3046), respectively, and an English translation of the Japanese Pharmacopeia uses the exact same sentence as the U.S. version.
Japanese-English Translation Blog 