-oso

Forms

-oso (adjective-forming suffix, feminine -osa, masculine plural -osi, feminine plural -ose)^[1]

Etymology

It is inherited from Latin -ōsus, which formed adjectives meaning “rich in, full of” chiefly from nouns (aquōsus, damnōsus).^{[2][3][4][5][1]} The Latin suffix comes from an older -ōssus.^[1]

Its origin is debated:^[1][6] a common view takes it from the root of odor (“smell”), Proto-Indo-European *h₃ed- (“to smell”), so that it first meant “smelling of” and then “full of”: hircōsus (“smelling like a goat”) and vīnōsus (“fond of wine”) may keep the older sense, and Ancient Greek -ώδης (-ṓdēs, “smelling like; full of”) shows the same change.^[1][6][7] Another proposal derives it from Proto-Indo-European *-wénts, which would make it a cognate of -οῦς (-oûs).^[1]

The same suffix is French -eux, Occitan -ós, Catalan -ós, Portuguese -oso, Friulian -ôs and Aromanian -os.^[1] English -ous came through Old French.^[8]

Semantic evolution

Latin already extended the suffix as -iōsus (religiōsus, labōriōsus) and -uōsus (montuōsus).^[5] In Italian it appears in many adjectives taken from Latin and in later ones formed from nouns, which mark the presence or plenty of a quality or condition: arioso, formoso, noioso, generoso.^[9][10] The variant -uoso is found in adjectives from Latin nouns of the fourth declension: affettuoso, fruttuoso, delittuoso.^[7] Devoto–Oli finds it mildly augmentative and records recent colloquial forms such as scattoso and sciccoso;^[3][7] Zingarelli notes archaic or new forms made from adjectives, such as robustoso and morbidoso.^[3][7]

In inorganic chemistry -oso marks the compounds of an element with the lower valence, as ferroso against ferrico.^[9][6][2] English -ous has the same chemical use.^[8]

Meanings

Suffix

1. Forms adjectives, chiefly from nouns, meaning having, full of or marked by what the base names: boscoso, ventoso, sieroso, afoso.^[6][10][7]
2. (chemistry) Marks compounds in which an element has its lower valence: solforoso, ipocloroso.^[7][6][9]

Related words

• -uoso
• Latin -osus
• French -eux
• English -ous

Usage notes

The suffix is pronounced with a voiced or a voiceless s (/ˈo.zo/, /ˈo.so/).^[1][7] In organic chemistry -oso with an open o is a variant of -osio, the suffix of sugar names.^[9][7]

References

1. ^ a b c d e f g h i Wiktionary, the free dictionary, https://en.wiktionary.org
2. ^ a b Nocentini, Alberto; Parenti, Alessandro (2010), l'Etimologico: vocabolario della lingua italiana, Firenze: Le Monnier
3. ^ a b c Devoto, Giacomo; Oli, Gian Carlo; Serianni, Luca; Trifone, Maurizio (2026), Nuovo Devoto–Oli: il vocabolario dell'italiano contemporaneo, digital ed., Milano: Le Monnier
4. ^ Gabrielli, Aldo (2020), Grande dizionario italiano, digital ed., Milano: Hoepli
5. ^ a b Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press
6. ^ a b c d e Sabatini, Francesco; Coletti, Vittorio; Manfredini, Manuela (2026), Dizionario italiano Sabatini Coletti, digital ed., Milano: Sansoni / Rizzoli Larousse
7. ^ a b c d e f g h Zingarelli, Nicola (2009), Lo Zingarelli 2010: vocabolario della lingua italiana, Bologna: Zanichelli
8. ^ a b Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
9. ^ a b c d Duro, Aldo (ed.) (1986–1994), Vocabolario della lingua italiana, Roma: Istituto della Enciclopedia Italiana; online ed. treccani.it/vocabolario (2008 copy)
10. ^ a b De Mauro, Tullio, Il Nuovo De Mauro, online ed., dizionario.internazionale.it