There are 4 definitions of lac in English:

lac1

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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.

Definition of lac in:

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Word of the day flippant
Pronunciation: ˈflipənt
adjective
not showing a serious or respectful attitude

There are 4 definitions of lac in English:

lac2

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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.

Definition of lac in:

There are 4 definitions of lac in English:

lac3

Line breaks: lac
Pronunciation: /lak
 
, lɑːk
 
/

noun

Variant spelling of lakh.

Definition of lac in:

There are 4 definitions of lac in English:

LAC4

Line breaks: LAC

abbreviation

Leading Aircraftman or Leading Aircraftwoman.