List: rare term

rare term  noun  noun (generic) 

• soapless soap (i.e. synthetic detergent)

abbreviation  rare term  noun  noun (generic) 

• United Nations Security Council

rare term  noun  noun (generic) 

• screw propeller

rare term  noun  noun (generic) 

• screw propeller

rare term  noun  noun (generic) 

• oligopoly

rare term  expression 

• All ships retreat (military command), complete ship withdrawal

rare term  noun  noun (generic) 

• flail (for threshing grain)

rare term  mathematics  noun  noun (generic) 

• complementary set, complement

rare term  noun  noun (generic) 

• North Pacific right whale (Eubalaena japonica)

rare term  noun  noun (generic) 

• Ediacara fossil biota