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*ser-

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Etymology and origin of the Proto-Indo-European word *ser-

*ser-1 to watch over, protect

Confidence
Probable

Reconstruction

LIV's 1.*ser- is "to watch out for, to protect".[1] De Vaan sets up the nouns *ser-u-o- "guardian" and *ser-u-o/h₂- "protection" from it.[2]

Morphology

LIV reconstructs an amphidynamic root present *sér-/sr-, seen in Avestan and in Greek ὄρονται (órontai, “they watch over”), whose o-grade is taken from the nouns *sor-ó- and *sor-ā́-; a u-present and an iterative *sor-éi̯e- are doubtful.[1] Greek ὁράω (horáō, “I see”) is a denominative of such a noun.[1]

Evidence

LIV's evidence is Avestan, Greek and, doubtfully, Lydian.[1] De Vaan adds Italic: Latin servō (“to watch over”), Umbrian verbs for watching birds, and perhaps Oscan.[2]

Meanings

  1. to watch out for, to protect[1]

Following Rix, de Vaan takes Proto-Italic *serwo- to have meant "guard, shepherd" before it became "slave" in Italy.[2]

Derivatives

  • *ser-u-o- "guardian" in Proto-Italic *serwo- (“shepherd”), whence Latin servus (“slave”);[2] Avestan hauruua- (“protecting”).[2]

Reflexes

  • Iranian: Avestan haraitē (“guards himself”), listed by LIV.[1]
  • Greek: Ancient Greek ὄρονται (órontai, “they watch over”), listed by LIV.[1]
  • Italic: Latin servō (“to watch over, look after”).[2]

*ser-2 to string together, link

Confidence
Established

Reconstruction

LIV's 2.*ser- is "to string together, link".[3] Rasmussen sets up *serH- instead, among other reasons because of Old Irish sernaid.[3] De Vaan reconstructs a present *ser-e/o- "to thread, tie together".[4]

Morphology

LIV reconstructs an amphidynamic root present *sér-/sr- in Latin serō (“to link, join”) and Greek εἴρω (eírō, “I string together”), a sigmatic aorist *sḗr/sér-s-, and an innovated Greek perfect.[3] Beekes notes that εἴρω must have lost its rough breathing, since the simplex is rare beside compounds like συνείρω (suneírō).[5]

Evidence

Beekes cites Greek, Latin and Oscan, Armenian, Celtic, Baltic and Germanic.[5] Derksen rejects the alleged Old Lithuanian word for "thread" that de Vaan and Beekes cite: it is a misreading of a form in Sirvydas's dictionary.[6] Kroonen finds it unsatisfactory to put Proto-Germanic *sarwa- (“armour, equipment”) here and separate it from Lithuanian šárvas (“armour”).[7]

Meanings

  1. to string together, to link[3]

Derivatives

Reflexes

  • Armenian: Old Armenian յեռում (yeṙum, “to tie, string together”).[8]
  • Greek: Ancient Greek εἴρω (eírō, “to knit together”).[5]
  • Italic: Latin serō (“to link, join”), Oscan aserum (“to lay onto”).[4]

*ser-3 to take, seize

Confidence
Probable

Reconstruction

LIV's 3.*ser- is "to take, seize", with a zero-grade present *sr̥-i̯é-.[9]

Evidence

LIV's verbal evidence is Greek αἱρέω (hairéō, “I take”) and Latvian sirt (“to go raiding”), and it adds nouns in Hittite and Celtic.[9] Kloekhorst reconstructs *sór-u- for Hittite šāru- (“booty, plunder”), beside Welsh herw (“plundering”) and Latvian sirt (“to loot”).[10]

Competing analyses

Beekes gives Ancient Greek αἱρέω (hairéō) no etymology.[11] LIV explains its inflection as a contract verb after the synonym ἀγρέω (agréō), with a suppletive aorist from *selh₁-.[9]

Meanings

  1. to take, to seize[9]

Derivatives

  • *sór-u- "booty" in Hittite šāru- (“booty, plunder”).[10]

Reflexes

  • Anatolian: Hittite šāru- (“booty”).[10]
  • Greek: Ancient Greek αἱρέω (hairéō, “to take”).[11]

*ser-4 to run, flow

Confidence
Disputed

Reconstruction

Beekes sets up a verbal root *ser- "run, flow", kept in Sanskrit सिसर्ति (sísarti), सरति (sárati) and the aorist असरत् (ásarat).[12] De Vaan reconstructs a noun *sér-o- "flowing, liquid".[13]

Competing analyses

De Vaan notes that the Sanskrit forms are usually derived from *sel-.[13] LIV lists Vedic असरत् (ásarat), प्रसिसर्ति (pra-sísarti) and ससार (sasā́ra) under 1.*sel- "to leap, jump".[14] Without them, de Vaan is left with only a Latin action noun with e-grade and a Greek agent noun with o-grade.[13]

Meanings

  1. to run, to flow[12]

Derivatives

  • *sér-o- in Latin serum (“whey”) and Sanskrit सर (sará-, “flowing, liquid”);[13] *sor-ó- in Ancient Greek ὀρός (orós, “whey”).[13]

Reflexes

  • Greek: Ancient Greek ὀρός (orós, “whey”).[12]
  • Italic: Latin serum (“whey”).[13]

References

  1. ^ a b c d e f g Rix, Helmut, et al. (2001), Lexikon der indogermanischen Verben, 2nd ed., Wiesbaden: Reichert, p. s.v. 1.*ser-
  2. ^ a b c d e f de Vaan, Michiel (2008), Etymological Dictionary of Latin and the other Italic Languages, Leiden Indo-European Etymological Dictionary Series 7, Leiden; Boston: Brill, p. s.v. servus
  3. ^ a b c d e Rix, Helmut, et al. (2001), Lexikon der indogermanischen Verben, 2nd ed., Wiesbaden: Reichert, p. s.v. 2.*ser-
  4. ^ a b c de Vaan, Michiel (2008), Etymological Dictionary of Latin and the other Italic Languages, Leiden Indo-European Etymological Dictionary Series 7, Leiden; Boston: Brill, p. s.v. serō
  5. ^ a b c Beekes, Robert S. P. (2010), Etymological Dictionary of Greek, with the assistance of Lucien van Beek, Leiden Indo-European Etymological Dictionary Series 10, Leiden; Boston: Brill, p. s.v. εἴρω
  6. ^ Derksen, Rick (2015), Etymological Dictionary of the Baltic Inherited Lexicon, Leiden: Brill, p. 563
  7. ^ Kroonen, Guus (2013), Etymological Dictionary of Proto-Germanic, Leiden Indo-European Etymological Dictionary Series 11, Leiden / Boston: Brill, p. 427
  8. ^ Martirosyan, Hrach K. (2010), Etymological Dictionary of the Armenian Inherited Lexicon, Leiden: Brill, p. 506
  9. ^ a b c d Rix, Helmut, et al. (2001), Lexikon der indogermanischen Verben, 2nd ed., Wiesbaden: Reichert, p. s.v. 3.*ser-
  10. ^ a b c Kloekhorst, Alwin (2008), Etymological Dictionary of the Hittite Inherited Lexicon, Leiden: Brill, p. 738
  11. ^ a b Beekes, Robert S. P. (2010), Etymological Dictionary of Greek, with the assistance of Lucien van Beek, Leiden Indo-European Etymological Dictionary Series 10, Leiden; Boston: Brill, p. s.v. αἱρέω
  12. ^ a b c Beekes, Robert S. P. (2010), Etymological Dictionary of Greek, with the assistance of Lucien van Beek, Leiden Indo-European Etymological Dictionary Series 10, Leiden; Boston: Brill, p. s.v. ὀρός
  13. ^ a b c d e f de Vaan, Michiel (2008), Etymological Dictionary of Latin and the other Italic Languages, Leiden Indo-European Etymological Dictionary Series 7, Leiden; Boston: Brill, p. s.v. serum
  14. ^ Rix, Helmut, et al. (2001), Lexikon der indogermanischen Verben, 2nd ed., Wiesbaden: Reichert, p. s.v. 1.*sel-

Descendants

Cite this entry

“*ser-.” Etymologically, 7 Nov. 2026, etymologically.com/ine-pro/*ser-. Accessed 8 Nov. 2026.

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