第だい二に級きゅう炭たん素そ原げん子し

Meanings

1

noun

secondary carbon atom

chemistry

Technical term in organic chemistry: a carbon atom bonded to two other carbon atoms.

charcoal, coal

素elementary, principle, naked

原meadow, original, primitive

子child, sign of the rat, 11PM-1AM

Compound of 第二級 (secondary, second class) + 炭素 (carbon) + 原子 (atom). A direct calque from English 'secondary carbon atom'.