cyrtomatodont noun 2adjective 1forms 1 noun2 •A knob- or hook-shaped hinge tooth on the shell of a brachiopod. •A shell or organism with such dentition.The deltidiodont morphology did not survive the end-Permian extinctions; the modern articulated brachiopod fauna is dominated by cyrtomatodonts with crurae and loops. — 2001 adjective1 •Hook-shaped, interlocking. formscyrtomatodonts