I. ˈkristə noun
( plural cris·tae -ˌstē, -ˌstī)
Etymology: Latin — more at crest
: crest , ridge : as
a. : the keel of a carinate sternum
b. : crista acustica
c. : a membranous spiral fold running the length of the body of certain spirochetes
d. : an elevation of the surface of a bone for the attachment of a muscle or tendon
II. noun
: any of the inwardly projecting folds of the inner membrane of a mitochondrion