Meanings

polycrystal

high school graduate who has failed university entrance examinations multiple times

the most home runs

characteristic polynomial

characteristic polynomial

beauty of scattered islets and islands (esp. of the Seto Inland Sea)

Hakata doll

numerous

polysynaptic reflex

multiple households

greatest number of people

Hakata (old but still commonly used name for Fukuoka)

polygenesis

knowing about many things

multiple pregnancy

many-sided wait (for one's last tile)

many-sided wait (for one's last tile)

overpopulation

sanguineness

many-to-one