Definition of cerastium in English:
 cerastium
nounPlural cerastiums sɪˈrastɪəm
A plant of a genus that includes chickweed and snow-in-summer.
Genus Cerastium, family Caryophyllaceae
 Example sentencesExamples
-  The differences between the two genera are small, such as 5 styles for Cerastium and 3 styles for Stellaria.
 -  Many species of Cerastium look alike and can be hard to differentiate.
 -  The bee on the Cerastium looks like he has got onto a queen sized bed and is snuggling up into a white downy quilt.
 
Origin
  
Modern Latin, from Greek kerastēs 'horned' (with reference to the shape of many seed capsules) + -ium.