(biology) The invagination of the cell membrane, at the equatorial plane of the cell, that characterizes the onset of cytokinesis in animal cells.

(slang, euphemistic) A clusterfuck.

plural of Ortokid

A habitational surname from Old Norse. / (location) A suburb of Sydney, New South Wales, Australia. / Hornsby Shire, a local government area in north Sydney, New South Wales.