There are 4 definitions of LAC in English:

LAC

Line breaks: LAC

abbreviation

  • Leading Aircraftman.

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Word of the day grotesquerie
Pronunciation: grəʊˈtɛskəri
noun
grotesque quality or grotesque things collectively

There are 4 definitions of LAC in English:

lac1

Line breaks: lac

noun

[mass noun]
  • A resinous substance secreted as a protective covering by the lac insect, used to make varnish, shellac, sealing wax, dyes, etc..

Origin

late Middle English: from medieval Latin lac, lac(c)a, from Portuguese laca, based on Hindi lākh or Persian lāk.

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Definition of lac in:

There are 4 definitions of LAC in English:

lac2

Line breaks: lac

adjective

Biology
  • Denoting the ability of normal strains of the bacterium E. coli to metabolize lactose, or the genetic factors involved in this ability (which is lost in some mutant strains): the lac operon
    More example sentences
    • These strains might not even use their lac gene products to metabolize lactose.
    • In addition to the lac operon, a number of other synthetic and natural genetic circuits have been analyzed for robustness and evolvability.
    • A metabolite of lactose binds to the lac repressor, changing the protein's shape and thereby causing it to loosen its grip on the DNA.

Origin

1940s: abbreviation of lactose.

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Definition of lac in:

There are 4 definitions of LAC in English:

lac3

Line breaks: lac
Pronunciation: /lak
 
, lɑːk
 
/

noun

  • variant spelling of lakh.

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Definition of lac in: