something without breaks or openings, something dense / a secret, (especially) something done secretly / (Buddhism) the teachings of esoteric Buddhism

to do an experiment

chemistry (branch of natural science)

Kyūjitai form of 仏陀: Buddha

Shatuo (a Turkic tribe that influenced northern Chinese politics from the late 9th century through the 10th century)

reuse

user; consumer / employer

employee / servant

something that has gone unused

An ordinary, lowly, itinerant monk.