Webster's Revised Unabridged Dictionary · 1913

Alanine

Alanine ({not transcribed}) , noun

[Aldehyde + the ending -ine. The -n- is a euphonic insertion.]

(Chemistry) one of the natural amino acids found combined in the proteins of most living tissues. It can be isolated as a white crystalline base, C3H7NO2. The natural form is the L-configuration.