lac1
/lak
/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.
lac2
/lak/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...
- 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.
lac3
/lak/ /lɑːk /noun
Variant spelling of lakh.
LAC4
abbreviation
Leading Aircraftman or Leading Aircraftwoman.
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