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One of the labial palpi of an insect. See Illust. under Labium.

second pair of maxillæ, usually closely united in the middle line, but bearing a pair of palpi in most insects. It often consists of a thin anterior part (ligula or palpiger) and a firmer posterior plate (mentum).

One of a tribe of beetles, having long maxillary palpi.

One of a family of clavicorn beetles, including those which have very long maxillary palpi.

to the mouth organs of insects, arachnids, crustaceans, and annelids; as, the mandibular palpi, maxillary palpi, and labial palpi. The palpi of male spiders serve as sexual organs. Called also palp. See Illust. of Arthrogastra and Orthoptera.

To beat with unnatural violence or rapidity; to palpitate, or throb; -- said of the heart. Spenser.

With palpitation or rapid breathing. Shak.

One of the Pedipalpi.

In a flutter; with palpitation or quick succession of beats. Lowell. "The fox's heart went pitapat." L'Estrange.

An order of Arachnoidea having the palpi terminated by large claws, as in the scorpions, but destitute of a caudal sting; the false scorpions. Called also Pseudoscorpii, and Pseudoscorpionina. See Illust. of Book scorpion, under Book.

Beating or palpitation; as, the saltation of the great artery.

pulmonate arachnids of the order scorpiones, having a suctorial mouth, large claw-bearing palpi, and a caudal sting.

One of a family of beetles having the maxillary palpi terminating in a hatchet-shaped joint.

One of a group of carabid beetles having slender palpi.

pulsate, with more than usual force or rapidity; to beat in consequence of agitation; to palpitate; -- said of the heart, pulse, etc. My heart Throbs to know one thing. Shak. Here may his head lie on my throbbing breast. Shak.