cristaPronunciation: /ˈkrɪstə/Definition of crista noun (plural cristae /-tiː/) 1 Anatomy & Zoology a ridge or crest. 2 Biology each of the partial partitions in a mitochondrion formed by infolding of the inner membrane. Derivatives cristate adjective Origin: mid 19th century: from Latin, 'tuft, plume, crest'crista in other Oxford dictionaries Definition of crista in the US English dictionary