hex-, hexa-

Concerning an organism having six larval hooks: Eucestoda, known as a hexacanth tapeworm, is a flatworm whose larvae have six posterior hooks on their heads and live in the digestive system of a vertebrate.

In sponge anatomy, one of the spicules forming six equal and similar rays meeting at right angles: Mr. Smart, the biology teacher, showed the students in his class a big photo of a skeleton of a sponge showing the triaxial form of its hexactines exemplified by its six arms grouped at right angles to one another.

A "spicule" is a small pointed structure serving as a skeletal element in various marine and freshwater invertebrates, such as sponges and corals.

A multiplicity of fingers, or toes, in which there are six digits on hands or feet.

Polydactyly in which there are six digits on a hand or a foot.

Having many fingers, or toes, usually with reference to a condition wherein there are six digits on a hand or a foot; or on both hands and feet.