LATIN DICTIONARYLexicon Latīnum
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“eight” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

eight
octo: octoni (distributive: eight a piece; eight each time, etc., and with nouns used in the plur., only; eight letters, octonae litterae; but eight letters of the alphabet, octo litterae: each chariot carried eight persons, octonos viros singuli currus vehebant): eight or nine, octo novem; octo aut novem: twice eight, bis octo: consisting of eight, octonarius (e.g., numerus; consisting of eight units, the number eight; fistula, a pipe, the plate of which is eight inches broad): eight years old, octo annos natus (octennis, Ammianus): every eight days, octavo quoque die: transactis octonis diebus (at the expiration of every eighth day): eight and a half, octo et dimidiatus or et dimidius; octo et semis (the latter when the half is that of a whole which is divided into twelve parts [semis == the half of an as]; thus, 8½ feet long, longus octo pedes et semissem; not sesqui-octavus, that is, in the proportion of 8:9, or 8½, λόγος ἐπόγδοος, ῆ + ή): eight-twelfths (the whole being an as), bes (Gen., bessis; as coin, weight, measure, etc.; also = 8 ounces [unciae] and 8 inches): eight inches long, bessalis: a litter or palanquin carried by eight persons, octophoros (lectica): eight asses, octussis (Hor., Sat., 2, 3, 156): in the year eight, octavo anno: to drive eight horses (of the person so conveyed), octojugibus vehi: the eight (at cards, dice, etc.), numerus octonarius: eight times, octies: eight times a year, octies anno: eight o’clock, secunda (sc. hora) according to the Roman reckoning; octava, according to ours: eight hundred, octingenti; (distributive) octingeni or octingenteni (both in Priscian, 1353, P.): consisting of eight hundred, octingenarius: eight hundred times, octingenties (late): the eight hundredth, octingentesimus.

Quick answer

What is the Latin word for eight?
The usual Latin words for “eight” are octō, octōni, octōnārius; also numerus, octennis. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.