A worm of the phylum Onychophora: an ecdysozoan organism with tiny eyes, antennae, multiple pairs of legs, and slime glands.

A chilognath myriapod of the genus Julus and allied genera, having numerous short legs along the sides; a millipede.

A horsehair worm (Nematomorpha) that fatally parasitizes insects and crustacea in its larval stage.

A gear arrangement consisting of a screw (the worm) whose thread meshes with a gear wheel in such a way as to turn the direction of drive through a right angle.

A worm and wheel, a gear arrangement consisting of a screw (the worm) whose thread meshes with a gear wheel to turn the direction of drive through a right angle, typically with a large (1:10 to 1:60) speed reduction and similar torque increase.

The larva of an American moth (Heliothis phloxiphaga), destructive to phloxes.

The common roundworm (Ascaris lumbricoides), sometimes found in the human intestine, and rarely in the stomach.

The larva of the juniper-twig geometer (Patalene olyzonaria), feeding upon the leaves of the juniper.

Alvinella pompejana, a deep-sea polychaete worm.

(vulgar, slang) To masturbate.