solaio

Forms

solaio m (plural solai)^[1] Old forms include solaro, solare and solario.^[2][3][4] The Old Genoese form was solar.^[5]

Etymology

It is inherited from Latin sōlārium (“place exposed to the sun; terrace, flat roof”), from sōl (“sun”).^[6][7][8][1] In Church Latin, from the 3rd century, the word also meant a flat roof and the space under the roof, the step towards the Italian sense.^[5][9][10] The Latin noun is formed with the suffix -ārium, through an adjective sōlārius (“relating to the sun”).^[1][11]

The word shows the normal Tuscan change of the Latin suffix -ārium to -aio.^[12] Devoto explained the unstressed ⟨o⟩ by a cross with suolo; it has no diphthong because the vowel was not stressed.^[12]

The same Latin word is Old French solier (“upper room; granary”) and Old Occitan solier (“flat roof”), Friulian solar (“ceiling”), Romansh soler in the Engadine, and, with another suffix, Catalan solar and Spanish solana.^[7][13] Venetian solero (“floor”) is the Old Venetian form, and Sicilian sularu the Sicilian.^[13][1] It was borrowed into German as Söller, a sunny upper terrace.^[7][13]

Earliest recorded meaning

The first record DELI gives is in Dante's Purgatorio (1313–1319), for the floor structure that carries a storey or a roof: “as a corbel to hold up a ceiling or a roof, one sometimes sees a figure with its knees drawn up to its chest” (Per sostentar solaio o tetto, / per mensola talvolta una figura / si vede giugner le ginocchia al petto).^[6][5][10]

Semantic evolution

In Old Italian the word named the beamed floor between two storeys, made of timber or of canes; today a solaio is mostly of steel or reinforced concrete.^[5][10] Zingarelli records an obsolete sense “storey” of a building.^[3]

In farmhouses the word came to mean a room under the roof, open on one side, where grain and fodder were dried;^[6][8][3] DELI dates it as solaro to before 1594 (Panigarola) and as solaio to 1821–1823 (Manzoni).^[6][8][3] From this grew the common sense of attic or loft, the space under the roof used for storing things, a synonym of soffitta and sottotetto.^[8][9][3]

Timeline

• 1313–1319 – Dante uses solaio in the Purgatorio.^[6][5]
• Before 1594 – Solaro is recorded for a rural room under the roof.^[6]
• 1821–1823 – Manzoni uses solaio in that sense.^[6]

Meanings

Noun

1. (building) A horizontal floor structure of beams, steel or reinforced concrete that divides the storeys of a building, serving as the ceiling of the room below and the floor of the room above: Il solaio del secondo piano poggia su travi di legno.^{[8][9][14][3]}
2. An attic or loft: the space between the roof and the ceiling of the top floor, used for storing things; a synonym of soffitta.^{[8][9][14][3]}
3. (regional) In farmhouses, a room under the roof, open on one side, for storing grain and fodder.^[8][3][4]
4. (obsolete) A storey of a building.^[8][3]

Word family

• assolaiato
• solarino

Related words

• sole
• solario
• suolo
• Latin solarium

Usage notes

The GDLI records three rare homographs: solaio “orbit of a planet round the sun”, derived from sole; an old solaio “shoemaker”, from sola for suola; and solaio (solaro) “palanquin, litter”, adapted from a word of India.^[5] The popular word solaio stands beside the learned solario.^[14] The plural is solai.^[14][3][1]

References

1. ^ a b c d e f Wiktionary, the free dictionary, https://en.wiktionary.org
2. ^ Battaglia, Salvatore; Bàrberi Squarotti, Giorgio (1961–2002), Grande dizionario della lingua italiana, 21 vols., Torino: UTET; digital ed. Accademia della Crusca, p. 19
3. ^ a b c d e f g h i j Zingarelli, Nicola (2009), Lo Zingarelli 2010: vocabolario della lingua italiana, Bologna: Zanichelli
4. ^ a b Gabrielli, Aldo (2020), Grande dizionario italiano, digital ed., Milano: Hoepli
5. ^ a b c d e f Battaglia, Salvatore; Bàrberi Squarotti, Giorgio (1961–2002), Grande dizionario della lingua italiana, 21 vols., Torino: UTET; digital ed. Accademia della Crusca
6. ^ a b c d e f g Cortelazzo, Manlio; Zolli, Paolo (1999), Dizionario etimologico della lingua italiana, 2nd ed. by Manlio Cortelazzo and Michele A. Cortelazzo, Bologna: Zanichelli
7. ^ a b c Nocentini, Alberto; Parenti, Alessandro (2010), l'Etimologico: vocabolario della lingua italiana, Firenze: Le Monnier
8. ^ a b c d e f g h De Mauro, Tullio (ed.) (2003), Grande dizionario italiano dell'uso, CD-ROM version 2.0, Torino: UTET
9. ^ a b c d Devoto, Giacomo; Oli, Gian Carlo; Serianni, Luca; Trifone, Maurizio (2026), Nuovo Devoto–Oli: il vocabolario dell'italiano contemporaneo, digital ed., Milano: Le Monnier
10. ^ a b c Duro, Aldo (ed.) (1986–1994), Vocabolario della lingua italiana, Roma: Istituto della Enciclopedia Italiana; online ed. treccani.it/vocabolario (2008 copy)
11. ^ Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press
12. ^ a b Devoto, Giacomo (1968), Avviamento alla etimologia italiana: dizionario etimologico, 2nd ed., Firenze: Le Monnier
13. ^ a b c Meyer-Lübke, Wilhelm (1935), Romanisches etymologisches Wörterbuch, 3rd ed., Heidelberg: Winter
14. ^ a b c d Sabatini, Francesco; Coletti, Vittorio; Manfredini, Manuela (2026), Dizionario italiano Sabatini Coletti, digital ed., Milano: Sansoni / Rizzoli Larousse