folding bone
(music) At pleasure; ad libitum.
plural of cold-back
(chemistry) The more liquid or volatile portion of certain oily substances, as distinguished from stearoptene, the more solid parts.
Synonym of bonefolder
小冊子を製本する前に、厚紙に折り目を付けるために骨べら（折り目付けヘラ）を使いました。
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