The only free and comprehensive online etymological dictionary of the Spanish language
melancolía f. (Noun) "meloncholy"
13th cent. Old Spanish malenconía. From Late Latin melancholia 'id.,' borrowed from Ancient Greek μελαγχολία ‎(melankholía) "black bile" (but more literally "bile-black"). From μέλας ‎(mélas) "black" (see melena (1)) and χολή (kholé) "gall" (see hiel).
melena (1) f. (Noun) "bloodied stool;" "bloodied vomit"
13th cent. From Latin melena 'id.' Borrowed from Ancient Greek μέλαινα (mélaina) "black" (m. μέλας (mélas)). From Proto-Indo-European *mel(h2)-n- "black."
Indo-European
Balto-Slavic
Old Prussian melne "blue spot," Lithuanian męl̃ns "black"
melena (2) f. (Noun) "long hair;" "mane"
Early 17th cent. From Arabic melina "softened," and probably through the Moors.
melón (1) m. (Noun) "melon"
Very early 15th cent. From Late Latin melonem, accusative of melo 'id.,' apocopation of earlier melopeponem "fruit (in the shape of an apple)." Borrowed from Ancient Greek μηλοπέπων (melopépon) 'id.,' a compound of μῆλον ‎(mêlon) "apple," "stonefruit" (see manzana) and πέπων ‎(pépon) "ripe." From Proto-Indo-European *pekw- "to cook," the same root behind cocer.
Sometimes used as an adjectival denoting awkward or uncomfortable behavior. Also the origin of a town in Orense.
Indo-European
Celtic
Middle Welsh pobi, Middle Breton pibi, Cornish pobas
Albanian
Albanian pjek
Balto-Slavic
Old Church Slavonic pešti, Russian peč, Czech péci, Cakavian pȅći, Lithuanian kèpti
Hellenic
Ancient Greek πέσσειν (péssein), Mycenaean -po-qo "baker"
Indo-Iranian
Sanskrit pácanti, Young Avestan pacaiti
Tocharian
A päk- B päk-
melón (2), meloncillo (Noun) "Egyptian mongoose"
14th cent. From Vulgar Latin melonem, accusative of melo 'id.' From Latin meles "badger." Of unknown origin, but compare Welsh bele "marten,"
Variants
Western Vulgar Latin: Asturian melón, Catalan melón
memoria f. (Noun) "memory"
From Latin memoria 'id.,' from memor "mindful." From Proto-Italic *me-mn-or- 'id.' From Proto-Indo-European *me-mn-os- 'id.' From the root *mei̯- "to be mindful (of)."
Indo-European
Romance
Portuguese memória, French mémoire, Italian memoria, Romanian memorie
Hellenic
Ancient Greek μαίνομαι (maínomai) "to rage"
-men Remnant of a noun-forming suffix in Latin.
From Latin -men 'id.' From Proto-Italic *-men 'id.' From Proto-Indo-European *-mn̥ 'id.'
Indo-European
Balto-Slavic
Old Church Slavonic -me
Hellenic
Ancient Greek -μᾰ (-ma)
Armenian
Armenian -awn
Indo-Iranian
Sanskrit -man, Avestan -man
menguar (Verb) "to wane"
12th cent. From Vulgar Latin *minuare 'id.,' from Latin minuere "to diminish." From Proto-Italic *minu-je/o- 'id.' From Proto-Indo-European *mi̯-n-h1- 'id.,' an n-infix from the root *mei̯h1- "less."
Indo-European
Romance
Asturian menguar, Portuguese minguar, Galician minguar, Italian minuire
Germanic
Gothic mins "less," Old Norse minnr 'id.,' Old High German mind 'id.,' Old Saxon min 'id.'
Hellenic
Ancient Greek μείων (meíon) "smaller"
Indo-Iranian
Sanskrit minā́ti "to damage"
Tocharian
B maiwe "small"
menor (Adverb, Noun) "young;" "minor"
12th cent. From Latin minor 'id.' From Proto-Italic *minos 'id.' From Proto-Indo-European *mi̯-n-u̯- 'id.,' an n-infix attached to *mei̯h1- "small."
As a surname, Menor was taken in sign of religious humility.
Indo-European
Romance
Portuguese menor, Galician menor, Catalan menor, French mineur, Italian minore, Romanian minor, Sardinian minore
Italic
Oscan mins "less"
Germanic
Gothic mins "less," Old Norse minnr 'id.,' Old High German mind 'id.,' Old Saxon min 'id.'
Hellenic
Ancient Greek μείων (meíon) "smaller"
Indo-Iranian
Sanskrit minā́ti "to damage"
Tocharian
B maiwe "small"
menos (Adverb) "less"
11th cent. From Latin minus 'id.,' neuter of minor (see menor).