noun:

• green car (1st class) ➜ 普通車

noun:

• Gastropoda (class of molluscs) ➜ 腹足類

noun:

• Actinopterygii (class of the ray-finned fishes comprising nearly 95% of the 25,000 species of fish)

noun:

• mosses (non-vascular plants of class Bryopsida)

counter:

• ~th period (e.g. ~th class in school day) ➜ 限目

noun:

• placoderms (extinct fishes of class Placodermi)

noun:

• Chondrichthyes (class comprising cartilaginous fishes)

noun:

• Monoplacophora (polyphyletic class of mollusks)

noun:

• the elite (class) - humorous term - colloquialism

noun:

• Diapsida (class of amniotes)

noun:

• Rostroconchia (class of extinct molluscs)

noun:

• Synapsida (class of amniotes)

noun:

• chiton (any marine mollusk of the class Polyplacophora); sea cradle
• Japanese chiton (Acanthopleura japonica)

noun:

• suou (ceremonial dress of lower-class samurai)

noun:

• Scaphopoda (class of molluscs comprising the tooth shells)

noun:

• symphylan (any centipede-like arthropod of class Symphyla)

noun / ~する noun:

• sitting on the floor grasping one's knees (as in a gym class) - Kansai dialect ➜ 体育座り

noun:

• learning good manners through apprenticeship (to an upper-class family) - four character idiom

noun:

• member (of a class); trainee; participant

noun:

• calcareous sponge (any sponge of class Calcarea)

noun:

• acorn worm (any hemichordate of class Enteropneusta)

noun:

• siliceous sponge (any sponge other than those of class Calcarea)

noun:

• enteropneusts (hemichordates of class Enteropneusta) - obscure term

noun:

• pterobranchs (hemichordates of class Pterobranchia)

noun:

• sitting on the floor grasping one's knees (as in a gym class)