| BLU | any of various grasses of the genus Poa |
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| BLU | an area in central Kentucky notied for it bluegrass and thoroughbred horses |
| BLU | an area in central Kentucky notied for it bluegrass and thoroughbred horses |
| BLU | an area in central Kentucky notied for it bluegrass and thoroughbred horses |
| BLU | a state in east central United States |
| BLU | small Atlantic wrasse the male of which has a brilliant blue head |
| BLU | a process that makes something blue (or bluish) |
| BLU | used to whiten laundry or hair or give it a bluish tinge |
| BLU | having a color similar to that of a clear unclouded sky |
| BLU | tinged with blue or purple from cold or contusion |
| BLU | small semi-evergreen shrubby tree of southeastern United States having hairy young branchlets and leaves narrowing to a slender bristly point |
| BLU | a serviceman in the navy |