The only free and comprehensive online etymological dictionary of the Spanish language
detrás (Adverb) "behind"
12th cent. From de and tras.
Indo-European
Romance
Asturian detrás
día m. (Noun) "day"
10th cent. From Vulgar Latin *dia, from Latin dies 'id.,' originally dius. From Proto-Italic *diē- 'id.' From Proto-Indo-European *di̯-eu̯-, the name of the Indo-European sky god. See also dios.
Indo-European
Romance
Asturian día, Portuguese dia, Galician día, Catalan dia, French -di, Italian , Aromanian dzuã, Romanian zi, Sardinian día
Italic
Oscan iúkleí "on the day" (< *di̯o-kelo-), Umbrian tiçel "day?" (meaning uncertain)
Celtic
Old Irish dïe, Old Welsh did, Old Breton ded, Old Cornish det
Balto-Slavic
Old Church Slavonic dьnь, Lithuanian dienà
Armenian
Armenian tiw
Indo-Iranian
Sanskrit dyáv- "day," "Sky Father," "god of the sky"
diablo m. (Noun) "devil"
10th cent. From Late Latin diabolus 'id.,' from Ancient Greek διάβολος (diábolos) "slanderer," but also "devil," composed of διά (diá) "across" and βάλλειν (bállein) "to throw." Greek διά is from Proto-Indo-European *dis "apart" (see des-); βάλλειν is from Proto-Indo-European *gwelh1- "to hit by throwing."
Indo-European
Romance
Asturian diablu, Portuguese diabo, Galician diablo, Catalan diable, French diable, Italian diavolo, Romanian diavol, Sardinian diàbulu
diáfano (Adjective) (especially of fabric) "translucent," "transparent"
Borrowed from Medieval Latin diaphanus "transparent," itself borrowed from Ancient Greek διαφανής (diaphanés) 'id.,' from διά- (dia) "through" and φαίνειν (phaínein) "to shine" (see fantasma for a continued etymology). Ancient Greek διά-, more literally read as "in two," probably derives from a pre-form *diha-, and thus is from Proto-Indo-European *di̯s "apart" (see dis-).
Indo-European
Hellenic
Lesbian ζά (dzá) "through"
diario m. (Adjective, Noun) "daily;" "daily newspaper"
16th cent. From Latin diarium 'id.' From dies "day" (see día).
dicho m. (Adjective, Noun) "said;" "saying"
Very late 15th cent. From Latin dictus 'id.,' past participle of dicere (see decir).
Indo-European
Romance
Asturian dichu, Portuguese dito, Galician dito, Catalan dit, French dit, Italian detto
Basque
Bizkaian deitu "call," Zuberoan déithü 'id.,' loanwords that Trask (2008) says points to a pre-form in Romance as *[deico]
diciembre m. (Noun) December
13th cent. From Latin december "December" (lit. "the tenth month"). December was the tenth month in the ancient Romulan calendar, but was moved to the twelfth position after Rome adopted the Republican calendar. From decem "ten" and mens "month." See diez and mes respectively.
Indo-European
Romance
Portuguese dezembro, Galician decembro, Catalan desembre, French décembre, Italian dicembre, Aromanian dechemvriu, Romanian decembrie
diciembre m. (Noun) "December"
13th cent. From Latin decembrem, accusative of december 'id.' From *decem membris "of the tenth month." From decem "ten" (see diez) and mensis "month" (see mes).
Indo-European
Romance
Asturian diciembre, Galician decembro, Portuguese dezembro, Catalan desembre, French décembre, Aromanian dechemvriu, Romanian decembrie
didáctico (Adjective) "didactic"
18th cent. Borrowed from Ancient Greek διδακτικός (didaktikós) "skilled in teaching," from διδακτός (didaktós) "learned." From the verb δῐδᾰ́σκειν (didaskein) "to teach," which was a causative reduplication of δαῆναι (daênai) "to learn." From Proto-Indo-European *dens- 'id.'
Indo-European
Romance
Galician didáctico, French didactique
Indo-Iranian
Sanskrit dasrá- "effecting miracles"
diente m. (Noun) "tooth"
12th cent. From Latin dentem, accusative of dens 'id.' From Proto-Italic *dens- 'id.' From Proto-Indo-European *h3d-n̥t- 'id.' From earlier *h3ed- of the same meaning.
Indo-European
Romance
Asturian diente, Portuguese dente, Galician dente, Catalan dent, French dent, Italian dente, Aromanian dinti, Romanian dinte, Sardinian dènte
Italic
Oscan dunte ? (meaning uncertain)
Celtic
Old Irish dét, Welsh dant
Germanic
Gothic tunþus, Old High German zand
Balto-Slavic
Russian desná, Lithuanian dantìs, Old Prussian dantis
Hellenic
Ionic ὀδών (odón)
Armenian
Armenian atamn
Indo-Iranian
Sanskrit dánt-, Young Avestan daṇtan-