(military) of or relating to friendly fire: blue-on-blue contacts
a small oyster, especially one from the oyster beds near Blue Point, Long Island, usually served raw on the half shell or in a cocktail. Historical Examples The Haunters of the Silences Charles G. D. Roberts
a widely distributed group of predominantly photosynthetic prokaryotic organisms of the subkingdom Cyanophyta, resembling phototrophic bacteria, occurring singly or in colonies in diverse habitats: some species can fix atmospheric nitrogen. Historical Examples Encyclopaedia Britannica, 11th Edition, Volume 16, Slice 5 Various plural noun the former name for cyanobacteria blue-green alga (bl’grēn’) See under cyanobacterium.
blue-hair Historical Examples Milton’s Comus John Milton
a print made on light-sensitive paper and used as a proof for checking the position of stripped-up negatives or positives and copy prior to platemaking.