LAC
- a resinous substance secreted by certain insects [n LACS]
- leading aircraftsman
- resinous substance deposited on the twigs of various trees in southern Asia by the female of the lac insect: used in the manufacture of varnishes, sealing wax, etc., and in the production of a red coloring matter
- (in India)
- indefinitely large number
- (in prescriptions) milk
- a resinous substance secreted by some insects [n -S]