a lamprey

(archaic) Synonym of 接骨木 (niwatoko).

八目鰻: a lamprey

(idiomatic) tears (drops from the eyes)

(informal) "not knowing even a millimeter": completely ignorant in regards to something

crēdō ut intelligam

Saturn (planet)

those who are given desk work, who are left out of the loop, as a form of constructive dismissal.

(sumo) the ring / a sandbag

(rare) a mole (burrowing insectivore) / (rare) an earthworm (worm (animal)) / (figuratively) an outstanding horse; an excellent horse; a famous horse (by metaphor from the meaning of the kanji)