The only free and comprehensive online etymological dictionary of the Spanish language
sí (2) (Pronoun) "himself," "herself," "itself"
From Vulgar Latin *si from Latin sibi "to himself," "to herself," "to itself." The loss of -bi was via analogy with mi. From Proto-Italic *sefei 'id.' From Proto-Indo-European *sebhi̯o 'id.'
siempre (Adverb) "always"
13th cent. From Latin semper 'id.' A compound of sem "once" (see mil for continued etymology) and per "through" (see por).
Para siempre "forever" is first attested in 12th cent. as por siempre.
Indo-European
Romance
Asturian siempre, Portuguese sempre, Galician sempre, Catalan sempre, Italian sempre, Sardinian sèmper
sierpe f. (Noun) "serpent"
From Vulgar Latin serpes 'id.,' from Latin serpens 'id.' (see serpiente).
Indo-European
Romance
Galician serpe, Catalan serp, Italian serpe, Aromanian sharpi, Romanian șarpe
siervo (Noun) "slave"
10th cent. Old Spanish servo. 13th cent. Old Spanish siervo. From Latin servus "slave," but originally "shepherd." From Proto-Italic *serwo- 'id.' From Proto-Indo-European *ser-u̯-o- "guardian." From a root *ser- meaning "to protect."
Indo-European
Romance
Asturian siervu, Portuguese servo, Catalan serf, French serf, Italian sierf, Romanian șerb
Italic
Oscan serevkidimaden "through watching," Umbrian šeritu "he observed"
Celtic
Middle Irish serb "theft," Cornish herw 'id.'
Balto-Slavic
Lithuanian sarióti "to raid," Latvian siŗu 'id.'
Hellenic
Ancient Greek αἱρέειν (hairéein) "to grasp"
Indo-Iranian
Avestan haraiti "he protects"
siete (Cardinal Number) "seven"
12th cent. From Latin septem 'id.' From Proto-Italic *septm̥ 'id.' From Proto-Indo-European *septm̥ 'id.'
Indo-European
Romance
Asturian siete, Portuguese sete, Galician sete, Catalan set, French sept, Italian sette, Aromanian shapti, Romanian șapte, Sardinian sete
Celtic
Gaulish sextan- "seven," Old Irish secht 'id.,' Middle Welsh seith 'id.,' Old Breton seith 'id.,' Old Cornish syth 'id.'
Germanic
Gothic sibun "seven," Old Norse sjau 'id.,' Old High German sibun 'id.,' Old Saxon siƀun 'id.,' English seven
Albanian
Albanian shtatë "seven"
Balto-Slavic
Old Church Slavonic sedmь "seven," Russian sem' 'id.,' Czech sedm 'id.,' Polish siedem 'id.,' Slovene sę́dəm 'id.,' Lithuanian septynì 'id.,' Latvian septiņi 'id.'
Hellenic
Ancient Greek ἑπτά (heptá) "seven"
Indo-Iranian
Sanskrit saptá "seven," Avestan hapta- 'id.'
significar (Verb) "to mean"
From Latin significare 'id.' but literally "to make a sign, mark." From signum "symbol" (see señal) and facere "to make" (see hacer).
Indo-European
Romance
Portuguese significar, Galician significar, Italian significare
siguemepollo m. (Noun) "ribbon worn by women that hangs from the back"
Literally sigueme pollo "follow me, boy." See seguir and pollo respectively.
siguiente (Adjective) "next"
From Latin sequentem, accusative of sequens 'id.' From sequi "to follow" (see seguir).
Indo-European
Romance
Portuguese sequência, Catalan seqüència, French séquence, Italian sequenza
silencio m. (Noun) "silence"
11th cent. Old Spanish silencio. From Latin silentium 'id.' From silere "to be silent." From Proto-Italic *sile- "to be silent," from *silo- "silent." From Proto-Indo-European *sh1/2i̯-ló- "silent."
Indo-European
Romance
French silence, Italian silenzio
Germanic
Gothic ana-silan "to become silent," Old English sālnės "silence"
silla f. (Noun) "chair"
10th cent. Old Spanish siella. From Latin sella 'id.' From Proto-Italic *sed-lā- 'id.' Derived from Proto-Indo-European *sed- 'id.'
Indo-European
Romance
Asturian siella, siya, Portuguese sela, silha, Catalan sella, French selle, Italian sella, Aromanian shauã, Romanian șa, Sardinian sedha