chelicera n.; pl. -erae [Gr. chele, claw; keras, horn] (ARTHRO: Chelicerata) Anterior most pair of appendages, functioning in grasping, holding, tearing, crushing or piercing; pincher-like in scorpions, but modified as poison fangs in spiders and as biting mouth parts of ticks.
cheliceral frame (ARTHRO: Chelicerata) That part of the tegu ment to which the chelicerae are attached.
cheliceral boss (ARTHRO: Chelicerata) In Araneae when present, a tear-shaped or wedge-shaped process on the distal part of the chelicera where it comes into contact with the clypeus.
cheliceral gland (ARTHRO: Chelicerata) One of paired glands in the dorsal part of the prosoma; the orifice is in the chelicerae.
cheliceral groove (ARTHRO: Chelicerata) One of paired longitudinal grooves in the dorsal surface of the infracapitulum, receiving and guiding the chelicera.
cheliceral sheath (ARTHRO: Chelicerata) A paired membranous sheath that attaches the chelicera to the cheliceral frame so as to allow extension and retraction.
cheliceral teeth (ARTHRO: Chelicerata) Serrations along the borders of the cheliceral groove.
Chelicerata, chelicerates n.; n.pl. A subphylum of arthropods without antennae, divided into three classes: the Merostomata, or horseshoe crabs; the Arachnida, spiders, scorpions, mites and relatives; and the Pycnogonida, or sea spiders.
cheliferous a. [Gr. chele, claw; L. ferein, to bear] Bearing or terminating in claws or chelae.
cheliform a. [Gr. chele, claw; L. forma, shape] Pincherlike.
cheliped n. [Gr. chele, claw; L. pes, foot] A claw-bearing appendage; forceps that bear at its tip a chela.
cheloniform a. [Gr. chelon, tortoise; L. forma, shape] Turtle or tortoise-shaped; limpet-like.
chelophores n.pl. [Gr. chele, claw; pherein, to bear] (ARTHRO: Chelicerata) Chelicerate first appendages of the arthropod class Pycnogonida.
chemiluminescence n. [Gr. chemeia, pert. chemistry; L. lu-minescere, to grow light] Enzymatic light production without increase in temperature in the course of a chemical reaction; bioluminescence.
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