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Borrowed from Latin ductus (leading, conducting, noun). Doublet of duct and douit.



ductus (plural ductus or ductuses)

  1. (writing)
    1. the number of strokes that make up a written letter, and the direction, sequence and speed in which they are written (Compare graph; see also aspect.)
    2. a subtle reduction of weight towards the middle of the stroke of the letter
  2. (anatomy) a duct, tube or canal in the body

Derived terms[edit]




Etymology 1[edit]

From dūcō (to lead, conduct, draw) +‎ -tus (action noun suffix).


ductus m (genitive ductūs); fourth declension

  1. (literally)
    1. (in general) leadership, leading, conducting
      Alicuius ductu imperioqueunder one’s command and authority
      • Caesar, de Bello Gallico VII, 62:
        Cuius ductu saepe numero hostes superassent
        under his leadership they had so often overwhelmed the enemy
    2. (military) generalship, military lead, conduct, command
      Synonyms: imperium, diciō
    3. (Medieval Latin) conveyance of water; a channel
  2. (figuratively) (of discourse)
    1. (acting) connection or structure of a play
    2. a period

Fourth-declension noun.

Case Singular Plural
Nominative ductus ductūs
Genitive ductūs ductuum
Dative ductuī ductibus
Accusative ductum ductūs
Ablative ductū ductibus
Vocative ductus ductūs
Derived terms[edit]

Etymology 2[edit]

Perfect passive participle of dūcō.


ductus (feminine ducta, neuter ductum); first/second-declension participle

  1. led, guided
  2. taken
  3. considered, thought

First/second-declension adjective.

Number Singular Plural
Case / Gender Masculine Feminine Neuter Masculine Feminine Neuter
Nominative ductus ducta ductum ductī ductae ducta
Genitive ductī ductae ductī ductōrum ductārum ductōrum
Dative ductō ductō ductīs
Accusative ductum ductam ductum ductōs ductās ducta
Ablative ductō ductā ductō ductīs
Vocative ducte ducta ductum ductī ductae ducta


  • ductus”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • ductus”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • ductus in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition with additions by D. P. Carpenterius, Adelungius and others, edited by Léopold Favre, 1883–1887)
  • ductus in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette
  • Carl Meißner; Henry William Auden (1894) Latin Phrase-Book[1], London: Macmillan and Co.
    • a conduit; an aqueduct: aquae ductus (plur. aquarum ductus)
    • the conversation began in this way: hinc sermo ductus est
    • (ambiguous) a thing is taken from life: aliquid e vita ductum est
    • (ambiguous) to derive a word from... (used of an etymologist): verbum ductum esse a...putare