主成分(しゅせいぶん) しゅせいぶん noun main ingredient; principal component formalsciencefood 1. main ingredient; principal component The substance that makes up the largest or most important part of something, such as a medicine, food or material. 主成分(しゅせいぶん)は水(みず)だ。 The main component is water. この薬(くすり)の主成分(しゅせいぶん)は何(なん)ですか。 What is the main ingredient of this medicine? 米(こめ)の主成分(しゅせいぶん)はでんぷんで、体(からだ)を動(うご)かすエネルギーになる。 The main component of rice is starch, which becomes energy for the body. 主(しゅ) (main) + 成分(せいぶん) (component, ingredient).Common collocations主成分(しゅせいぶん)とする: to have as its main component有効(ゆうこう)成分(せいぶん): the active ingredient (of a medicine)主成分分析(しゅせいぶんぶんせき): principal component analysis (statistics)Similar words原料(げんりょう): raw material something is made from; 主成分(しゅせいぶん) is what it consists of Related Words Compare: 原料(げんりょう) (raw material something is made from) general Added 2026.10.10 5:10 · Revised 2026.10.10 5:11 31500/31808_shuseibun