also: あかいろ
noun, noun which may take the genitive case particle 'no'
red; red color
General term for the color red; can be used as a noun or adjectivally with の. The reading あかいろ is more casual, while せきしょく appears in formal or technical contexts.
赤色のペンで名前を書いてください。
Please write your name with a red pen.
信号が赤色に変わった
The traffic light turned red.
noun-modifying (irregular)
communist; socialist; left-wing
Only with reading せきしょく
Prenominal use (adj-f) with the reading せきしょく, referring to communist or leftist ideology. Often seen in political contexts.
彼は赤色政権を批判した。
He criticized the communist regime.
赤色テロが社会問題になった。
Red terror became a social issue.