Alternative spelling of 赤腹井守 (“Japanese fire belly newt”)

a Japanese fire belly newt (Cynops pyrrhogaster)

(obsolete) Synonym of トマト (tomato, “tomato”)

Alternative spelling of 赤立羽 (“Indian red admiral”)

an Indian red admiral (Vanessa indica)

"red sheet", specifically a red translucent plastic sheet used in studying to render red-colored text illegible

(Internet slang) secret personal account (on social media, especially Twitter and Instagram (finsta), as opposed to one's openly used account)

Red alpenglow of Mount Fuji in the morning, especially in early autumn.

(Internet slang) protected account (on social media, especially Twitter and Instagram)

red dragonfly (generic term)