plural of spectral class

plural of crystal class

(crystallography) Any of 32 possible classes of crystals, arising from the 32 possible combinations of symmetry operations.

plural of third class

(computing, object-oriented programming) Alternative form of superclass / (taxonomy) Alternative form of superclass

plural of super class

(Australia, New Zealand) The work of a wool classer, sorting and assigning grades to wool according to its quality.

(sociology) A participant in class warfare.

plural of class warrior

(regular expressions) Characters which are excluded in a pattern.