やくしん^２【躍進】 ¶躍進する　 make rapid progress; advance rapidly [by leaps and bounds]; take [make] great [rapid] strides; leap ahead; take [make] a great leap forward /日本の経済的躍進　 Japan's rapid economic progress ‖日本の化学工業は一大躍進を遂げた.　 The chemical industry in Japan has developed remarkably.

やくす^１【約す】 ⇒やくぶん^１ (約分する).

やくす^２【訳す】 translate from English into Japanese; put [｛文｝ render] a Soseki novel into German ¶次の日本語を英語に訳しなさい.　 Translate [Turn] the following Japanese into English. /「生活者」などという日本語は英語に訳すのは不可能だ.　 It's impossible to translate [put] a Japanese word like seikatsusha into English. /詩を外国語に訳すのは至難のわざだ.　 It's excruciatingly difficult to translate poetry into a foreign language.

やくすう【約数】 〔数〕 a divisor; a factor.

やくせき【薬石】 ¶薬石効無く不帰の客となった.　 Treatment proved ineffective and he departed this world.

やくぜん【薬膳】 a Chinese meal combining food and traditional medicines.