type of amino acid common in animal proteins, 1880, from German serin (Cramer, 1865), from Latin sericum "silk" (see serge), with chemical suffix -ine (2). So called because it was originally derived from silk.
late 14c., sarge, in reference to a woolen cloth in use in the Middle Ages, apparently of a coarse texture, from Old French sarge, serge (12c.), Medieval Latin sargium, sargea "cloth of wool mixed with silk or linen," from Vulgar Latin *sarica, from Latin serica (vestis) "silken (garment)," from serica, from Greek serikē, fem. of serikos "silken" (see silk).
In later use of a kind of strong, durable fabric, originally woven of silk, later of worsted. The French word is the source of German sarsche, Danish sarge, etc. Also as a verb. Related: Serger.
word-forming element in chemistry, often interchangeable with -in (2), though modern use distinguishes them; early 19c., from French -ine, the suffix commonly used to form words for derived substances, hence its extended use in chemistry. It was applied unsystematically at first (as in aniline), but now has more restricted use.
The French suffix is from Latin -ina, fem. form of -inus, suffix used to form adjectives from nouns, and thus is identical with -ine (1).
<a href="https://www.etymonline.com/word/serine">Etymology of serine by etymonline</a>
Harper, D. (n.d.). Etymology of serine. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/serine