One of two elongated, often segmented appendages, usually found near the mouth in invertebrate organisms: Pulpi are found in mollusks, crustaceans, and insects and have functions in sensation, locomotion, and feeding.

The segmented appendages arising from the labium, or lower "lip" of the head: The labial palps in certain organisms have a sensory function while consuming food.

One of the pair of jointed appendages originating from the maxillae: The maxillary palp is small, like an antenna, and is a sensory attachment that develops from the upper jawbone.

The standard method of indicating the number of segments in the maxillary (second pair of jaws under the principal pair) and labial palps respectively: If the palp formula had six,four; it would mean six segments in the maxillary palp and four in the labial palp.

Latin: to touch gently, to stroke; to pat; in this unit.