| ALU | tuft of small stiff feathers on the first digit of a bird's wing |
|---|---|
| ALU | scale-like structure between the base of the wing and the halter of a two-winged fly |
| ALU | (zoology) pertaining to alulae |
| ALU | a double sulphate of aluminum and potassium that is used as an astringent (among other things) |
| ALU | a person who has received a degree from a school (high school or college or university) |
| ALU | a white crystalline double sulfate of aluminum: the potassium double sulfate of aluminum |
| ALU | a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum |
| ALU | any of several herbs of the genus Heuchera |
| ALU | any of various forms of aluminum oxide occurring naturally as corundum |
| ALU | a compound of alumina and a metallic oxide |
| ALU | containing aluminum or alum |
| ALU | cover with aluminum |