Blue"berry (&?;), n. [Cf. Blaeberry.] (Bot.) The berry of several species of Vaccinium, an ericaceous genus, differing from the American huckleberries in containing numerous minute seeds instead of ten nutlets. The commonest species are V. Pennsylvanicum and V. vacillans. V. corymbosum is the tall blueberry.

• Any of some plants of the genus Vaccinium that produces edible, round, blue berries (botanically false berries) with flared "crowns" at the end that turn blue on ripening.
  
• The fruit of these plants.
  
• (colour) A dark blue colour.
       blueberry colour:   
  
• (geology) A mineral formation first identified by the Mars Exploration Rover Opportunity in 2004, so-named because of its resemblance to blueberry muffins. We see these strange round objects we're calling “spherules” embedded in the outcrop, like blueberries in a muffin.
  
• Containing blueberries or having the flavour of blueberries.
       blueberry pie
  
• Of a dark blue colour.