unio

From the genus name.

unio (plural unios)

1. Any of the genus Unio of freshwater mussels.
   • 1894, Sleep of mollusks (in Popular Science, volume 45, number 1, May 1894, page 99)

     In June, 1850, a living pond mussel was sent to Dr. Gray from Australia which had been kept out of water more than a year, and instances of the survival of unios without moisture for long periods are not rare.

• Unio (bivalve) on Wikipedia.Wikipedia
• Unio on Wikispecies.Wikispecies
• Unio on Wikimedia Commons.Wikimedia Commons
• Unio at the Catalogue of Life 

• Audio

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• IPA^(key): /uˈnio/
• Hyphenation: u‧ni‧o
• Rhymes: -io

unio (accusative singular union, plural unioj, accusative plural uniojn)

1. (politics) A union (of states)

• Eŭropa Unio
• Sovetunio
• Unio de Sovetaj Socialistoj Respublikoj

• sindikato (“syndicate, labor union”)

• (Classical) IPA^(key): /ˈuː.ni.oː/
• (Ecclesiastical) IPA^(key): /ˈu.ni.o/, [ˈuː.ni.o]

ūnus (“one”) +‎ -iō.

ūniō f (genitive ūniōnis); third declension

1. (Late Latin) a unity, union
   • Eusebius Hyeronymus, Epistolae :

     Virga mater est Domini, simplex, pura, sincera, nullo extrinsecus germine cohaerente, et ad similitudinem Dei unione fecunda. Virgae flos Christus est, dicens: "Ego flos campi, et lilium convallium".

     The stalk is the mother of God, simple, pure, sincere, adjoined by no other sprout from outside, in a manner similar to the fertile unity of God. The flower of the stalk is Christ, saying, "I am the flower of the field, and the lilly of the valleys."

2. (Ecclesiastical Latin) the number one, oneness, unity
   • Eusebius Hyeronymus, In Amos :

     Decas decima unione completur.

     A decade is complete with the tenth unit.

Third declension.

ūnus (“one”) +‎ -iō.

ūniō (present infinitive ūnīre, perfect active ūnīvī, supine ūnītum); fourth conjugation

1. I unite, I combine into one.

• Charlton T. Lewis, Charles Short, A Latin Dictionary entry for "unio" meaning unite

Traditionally considered to be the same as Etymology 1, but the masculine gender and semantic shift are hard to explain.

Alternatively from a Proto-Italic *uznjō, continuing a Proto-Indo-European *wósHr̥- ~ *usHén- (“garlic, onion”) seen also in Hittite 𒉿𒀸𒄩𒅈 (wašḫar, “garlic”), Sanskrit उष्ण (uṣṇa, “onion”), Pashto ووږه‎ (wúģa, “garlic”), Khowar [script needed] (wəẓnū, “garlic”)[1].

ūniō m (genitive ūniōnis); third declension

1. a kind of onion

   Caepam, quam vocant ūniōnem rūsticī. ― The onion, which peasants call unio.

2. a kind of pearl

   Ūniō Cleopatrānae ― Cleopatra's pearl

Third declension.

• (onion): caepa, cēpa
• (pearl): margarita

• → Old English: *ynne, ynnelēac
• Old French: oingnun
  • → Dutch: ajuin, uien, ui
  • → English: onion
  • French: oignon, ognon
  • Norman: ouongnon
• → Translingual: Unio

• unio in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
• unio in Gaffiot, Félix (1934) Dictionnaire Illustré Latin-Français, Hachette
• unio in Harry Thurston Peck, editor (1898) Harper's Dictionary of Classical Antiquities, New York: Harper & Brothers

unio

1. vocative singular of unia