Kyūjitai form of 赤経 (“right ascension”)

(astronomy) declination

(literally) red beard; a man with a red beard / a Ryukyu robin, Larvivora komadori

a red sun, a bright sun, or the summer sun / a day in the traditional Japanese six-day week which is unlucky except for at noon

red turnip (any of several varieties of turnip (Brassica rapa) that are red or purple in color) / radish / beet, beetroot

(mineralogy) bieberite

stingray, specifically whiptail stingray, more specifically red stingray

stingray, specifically whiptail stingray, more specifically red stingray

failing grade

(obsolete) Soviet Union