【医】 undermined enamel
naught; nonexistence; not; nothing; without; lack; zero
【医】 a-; leipo-; lipo-; non-
base; basic; foundation; key; primary; radix
【化】 group; radical
【医】 base; basement; group; radical
【医】 adamant; enamel; enamelum; stratum adamantinum