platy-

Broad or flat.

Greek platus, broad, flat.

The platypus (Greek pous, foot) is a semiaquatic egg-laying mammal of eastern Australia with flat, webbed feet; a platyhelminth is member of a phylum of invertebrates that comprises the flatworms; platyrrhine (Greek rhis, rhin‑, nose) refers to primates of a group that comprises the New World monkeys, marmosets, and tamarins, which have nostrils that are far apart and directed forwards or sideways; the platysma is a broad sheet of muscle fibres extending from the collar bone to the angle of the jaw.