siero

Forms

siero m (plural sieri)^[1] Old and regional forms include Old Italian siere, Old Italian sielo and Old Italian sero, and Roman sièle.^[2][3][4]

Etymology

It is inherited from Latin serum (“whey”), the watery part of curdled milk.^[5][6][7][1] The same word is Friulian sir and Aromanian şar, while Spanish suero, Portuguese soro and Sardinian soru continue an unrecorded variant Vulgar Latin *sorum.^[6][8][9] Körting also listed Romanian zer, whose Latin origin Densusianu disputed.^[9]

The Latin word goes back to Proto-Italic *serom (“liquid”) and Proto-Indo-European *sér-o- (“flowing, liquid”).^[10][1] It may be cognate with Sanskrit सर (sará, “flowing”);^[6][10][11] Ancient Greek ὀρός (orós, “whey”), a Homeric word from an older form with initial ⟨s⟩ and ⟨o⟩ in the root, also explains the Romance variant with ⟨o⟩.^[6][10][11] De Vaan notes that the Sanskrit words are usually derived from a different root, so the comparison is not certain.^[10]

The many derivatives in ⟨siero-⟩, such as sierologia and sieroterapia, match learned formations across Europe, as French sérothérapie and the English serotherapy.^[5]

Earliest recorded meaning

GRADIT and Nocentini date the word to before 1320, in the sense “whey”.^[7][6] DELI's first example is the translation of Crescenzi's treatise on farming, about 1350: the yellowish, cloudy liquid left in the vat when the cheese is taken out.^[5] The same text says the siere must be drained from the cheese.^[12]

Semantic evolution

Medieval medicine prized whey, and Bencivenni calls it medicina buona, a good remedy.^[4] The word extended to the watery part of the blood in the Fasciculo di medicina of 1494.^[5]

With immunology it acquired its modern medical sense: a serum taken from immunised animals and injected to treat or prevent disease, as in sieroterapia (1894) and siero di Behring (1905).^[5][7] Sierologia followed in 1911.^[5] Siero della verità, the truth serum, is a drug that lowers a person's inhibitions during questioning.^[13][14][15]

Timeline

• Before 1320 – GRADIT's first date, in the sense “whey”.^[7]
• c. 1350 – The translation of Crescenzi uses siero for whey.^[5]
• 1494 – The Fasciculo di medicina uses it for blood serum.^[5]
• 1611 – Sieroso is recorded by Florio.^[5]
• 1894 – Sieroterapia is recorded.^[5]
• 1899 – The sense “therapeutic serum” appears in Ferrio.^[5]
• 1911 – Sierologia is recorded.^[5]

Meanings

Noun

1. (physiology) serum, the liquid part of a body fluid left after it coagulates: siero del sangue.^{[7][16][15][1]}
2. whey, the liquid left from milk after cheese-making: siero del latte.^{[7][13][14][1]}
3. (medicine) A serum from the blood of immunised animals, injected to treat or prevent a disease: siero antivipera.^[7][16][17]
4. siero della verità: truth serum.^[13][15][14]

Word family

• sieroso
• sierosità
• sierosa
• sierologia
• sieroterapia
• sieroprofilassi
• sierico
• antisiero

Related words

• Latin serum

References

1. ^ a b c d e f Wiktionary, the free dictionary, https://en.wiktionary.org
2. ^ Battisti, Carlo; Alessio, Giovanni (1950–1957), Dizionario etimologico italiano, 5 vols., Firenze: Barbèra (reprint 1975), p. 3491
3. ^ Prati, Angelico (1951), Vocabolario etimologico italiano, Milano: Garzanti, p. 917
4. ^ a b Battaglia, Salvatore; Bàrberi Squarotti, Giorgio (1961–2002), Grande dizionario della lingua italiana, 21 vols., Torino: UTET; digital ed. Accademia della Crusca, p. 18, 1077
5. ^ a b c d e f g h i j k l Cortelazzo, Manlio; Zolli, Paolo (1999), Dizionario etimologico della lingua italiana, 2nd ed. by Manlio Cortelazzo and Michele A. Cortelazzo, Bologna: Zanichelli
6. ^ a b c d e Nocentini, Alberto; Parenti, Alessandro (2010), l'Etimologico: vocabolario della lingua italiana, Firenze: Le Monnier
7. ^ a b c d e f g De Mauro, Tullio (ed.) (2003), Grande dizionario italiano dell'uso, CD-ROM version 2.0, Torino: UTET
8. ^ Meyer-Lübke, Wilhelm (1935), Romanisches etymologisches Wörterbuch, 3rd ed., Heidelberg: Winter
9. ^ a b Körting, Gustav (1907), Lateinisch-romanisches Wörterbuch: etymologisches Wörterbuch der romanischen Hauptsprachen, 3rd ed., Paderborn: Schöningh
10. ^ a b c d de Vaan, Michiel (2008), Etymological Dictionary of Latin and the other Italic Languages, Leiden Indo-European Etymological Dictionary Series 7, Leiden; Boston: Brill
11. ^ a b Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press
12. ^ Tommaseo, Niccolò; Bellini, Bernardo (1861–1879), Dizionario della lingua italiana, 4 vols., Torino: UTET
13. ^ a b c Zingarelli, Nicola (2009), Lo Zingarelli 2010: vocabolario della lingua italiana, Bologna: Zanichelli
14. ^ a b c Gabrielli, Aldo (2020), Grande dizionario italiano, digital ed., Milano: Hoepli
15. ^ a b c Vocabolario della lingua italiana Treccani (2011), Roma: Istituto della Enciclopedia Italiana
16. ^ a b Devoto, Giacomo; Oli, Gian Carlo; Serianni, Luca; Trifone, Maurizio (2026), Nuovo Devoto–Oli: il vocabolario dell'italiano contemporaneo, digital ed., Milano: Le Monnier
17. ^ Sabatini, Francesco; Coletti, Vittorio; Manfredini, Manuela (2026), Dizionario italiano Sabatini Coletti, digital ed., Milano: Sansoni / Rizzoli Larousse