Meanings

Ryōtan (region in Kansai corresponding to the two historical provinces of Tanba and Tango)

Amphibia (class comprising the extant and extinct amphibians)

two

ambidexterity

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

bisexuality

construction vehicle (bulldozer, backhoe, loader, etc.)

(woman with) beautiful eyes and mouth

(woman with) beautiful eyes and mouth

both groups

both governments

tank destroyer

upside-down fern (Arachniodes standishii)

bisexual flower

Asarum caulescens (species of wild ginger)

bimetallism

railroad car covered in wrap advertising

even small mistakes can be costly

both prefectures

both schools