usとは 意味・読み方・使い方

接尾辞

-us

1. alternative form of -ous

語源 2

接尾辞

-us

1. (West Midland) alternative form of -es.

参照

発音

• (Classical Latin) IPA: [ˈʊs]
• (modern Italianate Ecclesiastical) IPA: [ˈus]

接尾辞

-us

1. suffix of nouns in the second declension.
   1. (chiefly) nominative singular of -us
   2. (not productive) nominative/accusative/vocative singular of -us for second-declension neuter nouns.

      vīrus (“a poisonous or acrid secretion”); vulgus (“common people”); pelagus (“sea”)

2. suffix of adjectives in the first/second declension.
   1. (chiefly) nominative singular of -us
3. (New Latin) suffix used to Latinize names ending in consonants.

使用する際の注意点

For certain nouns whose roots end with the letter r, no ending is applied in the nominative and vocative singulars; instead, an e is added before the r, if there isn't one already in the root (i.e. liber (root libr-), alabaster (root alabastr-), puer (root puer-)), although some, such as the aforementioned puer, have alternative forms with regular -us and -e endings in the nominative and vocative singulars. The only irregular masculine noun in this regard is vir, whose nominative and vocative singulars would be expected to be *virus and *vire.

語形変化

派生語

語源 2

Generally from Proto-Indo-European *-os (suffix forming neuter s-stem nouns from verbs), as in genus n from *ǵénh₁os n (“race”). Not a productive derivational suffix in Latin. The plural and oblique case forms have -r- as the result of the sound change of rhotacism. Additionally, in many words, the oblique stem has the vowel -ĕ- (as in generis), which is generally taken to be the phonetically regular development of the Proto-Indo-European forms. Some words, such as decus, decoris, instead have -ŏ- in the oblique stem; this is the result of analogical introduction of the rounded vowel from the nominative/accusative singular form.

発音

• (Classical Latin) IPA: [ˈʊs]
• (modern Italianate Ecclesiastical) IPA: [ˈus]

接尾辞

-us n

1. ending of some neuter nouns in the third declension.
   1. nominative/accusative/vocative singular of -us

語形変化

派生した語

From the plural -ora:

• Romanian: -uri (final vowel replaced due to analogy with feminine plural forms)
• Sicilian: -ura, -ira, -ara

語源 3

Not a single suffix, but an ending of various miscellaneous origins. In most words, from Old Latin -us, from Proto-Italic *-us, from Proto-Indo-European *-us as the final part of Proto-Indo-European *-tus (suffix deriving action nouns from verb roots).

発音

• (Classical Latin) IPA: [ˈʊs]
• (modern Italianate Ecclesiastical) IPA: [ˈus]

接尾辞

-us m or f

1. nominative/vocative singular of -us for non-neuter nouns in the fourth declension.

語形変化

接尾辞

-ūs

1. nominative/vocative plural of -us for fourth-declension nouns.
2. genitive singular of -us for fourth-declension nouns.
3. accusative plural of -us for fourth-declension nouns.

参考

• -tus

参照

• “-us” on page 2,108/2 of the Oxford Latin Dictionary (1st ed., 1968–82)

アナグラム

• SU, Su

略号

US$

1. The currency symbol for the United States dollar.

   Synonyms: U$, USD

   • 2019 June 4, “Global Vertical Lift Module (VLM) Market Will Register at a CAGR of 7.58% by 2025, Predicts QY Research”, in PR Newswire‎, United States, archived from the original on 8 September 2025:

     The global vertical lift module (VLM) market is expected to be valued at US$ 595.86 mn by 2025 from US$ 358.15 mn in 2018. The market will register at a CAGR of 7.58% throughout the forecast period.

使用する際の注意点

• Opinions vary regarding the use of apostrophes when forming the plurals of letters of the alphabet. New Fowler's Modern English Usage, after noting that the usage has changed, states on page 602 that "after letters an apostrophe is obligatory." The 15th edition of The Chicago Manual of Style states in paragraph 7.16, "To avoid confusion, lowercase letters ... form the plural with an apostrophe and an s". The Oxford Style Manual on page 116 advocates the use of common sense.

アナグラム

• SU, Su