(relativity) the theory of relativity

(rare) duality

radioactive element

forward compatibility

backward compatibility

(medicine) congestive heart failure

a kind of comedy performance, wherein one person wears a 羽織 (haori) with their arms not in the sleeves and their head and face free and visible as normal, and another person behind slips into the same haori and puts their arms through the sleeves with the back of the haori over their own head, and then, without being able to see, tries to feed the first person

xenophobia

xenophobia

(Buddhism) a phrase written on walking sticks, hats, and other implements of pilgrims walking along the 四国巡礼 (Shikoku Junrei, “Shikoku pilgrimage”)