explorer (person who by means of travel searches out new information)

(traditional Chinese medicine) rhizome of Gentiana scabra var. buergeri / alternative form of 竜胆 (rindō)

carbonic acid / Clipping of 炭酸飲料 (tansan inryō, “carbonated drink”).

gallstones

extreme

the extreme / the edge, the boundary

(organic chemistry) pentane

to apportion, to allot, to divide, to share work, duties, responsibilities, etc.

monotone, toneless, prosaic / menial

monotony