(marketing) An artificial flavor used in candy and soft drinks, which, despite the name, is not derived from any species of raspberry.

Quercus douglasii, an oak tree endemic to California. / Synonym of bur oak (Quercus macrocarpa).

(Internet, Wiktionary and WMF jargon) Of or pertaining to a blue link; any link that directs to an existing wiki.

(now historical) The extinct bluebuck, Hippotragus leucophaeus.

A bright azure pigment manufactured by cultures of pre-Columbian Mesoamerica.

A moderately deep greenish-blue color.

Hirundo atrocaerulea, a species of swallow.

(ichthyology) A long-lived freshwater species of fish in the sucker family that is of conservation concern.

plural of Blue Sucker

(US politics) A surge of voters supporting the candidates of the Democratic Party during an election (especially a midterm election), which results in the party making significant gains.