best friend
(biochemistry) A nonessential amino acid C₅H₉NO₂ found in most animal proteins, especially collagen; its cyclic structure leads to kinks in the peptide chain of proteins.
(music, countable or uncountable) The exact pitch of a note as established by its rate of vibration based on a standard scale.
Used other than figuratively or idiomatically: see best, friend. / An especially close and trusted friend. / (informal) An object or concept considered very useful or helpful.
plural of reaction turbine
雨が降り始めたとき、私の親友はコートを貸してくれた。
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DiQt（ディクト）
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