a combining form meaning “milk,” used in the formation of compound words (lactometer); specialized in chemical terminology to mean “lactate,” or “lactic acid.”.
combining form
indicating milk: lactobacillus

before vowels, lac-, word-forming element meaning “milk,” from Latin lac (genitive lactis) “milk,” from PIE root *glakt- (see lactation).

lacto- or lact- or lacti-


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    [lak-toh-buh-sil-uh s] /ˌlæk toʊ bəˈsɪl əs/ noun, plural lactobacilli [lak-toh-buh-sil-ahy] /ˌlæk toʊ bəˈsɪl aɪ/ (Show IPA). Bacteriology. 1. any long, slender, rod-shaped, anaerobic bacterium of the genus Lactobacillus, that produces large amounts of lactic acid in the fermentation of carbohydrates, especially in milk. /ˌlæktəʊbəˈsɪləs/ noun (pl) -li (-laɪ) 1. any Gram-positive rod-shaped bacterium of the […]

  • Lactocele

    lactocele lac·to·cele (lāk’tə-sēl’) n. See galactocele.

  • Lactoferrin

    [lak-tuh-fer-in] /ˌlæk təˈfɛr ɪn/ noun, Biochemistry. 1. a glycoprotein present in milk, especially human milk, and supplying iron to suckling infants.

  • Lactoflavin

    [lak-toh-fley-vin, lak-toh-fley-] /ˌlæk toʊˈfleɪ vɪn, ˈlæk toʊˌfleɪ-/ noun, Biochemistry. 1. . /ˌlæktəʊˈfleɪvɪn/ noun 1. a less common name for riboflavin lactoflavin lac·to·fla·vin (lāk’tə-flā’vĭn, lāk’tə-flā’-) n. See riboflavin.

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