Dictionary:

chelicera

  (kĭ-lĭs'ər-ə)

Either of the first pair of fanglike appendages near the mouth of an arachnid, such as a spider, often modified for grasping and piercing.

[New Latin : CHELA + Greek keras, horn.]

Pair of movable oral appendages adapted for cutting carried by acarids, including ticks.

The noun has one meaning:

Meaning #1: either of the first pair of fang-like appendages near the mouth of an arachnid; often modified for grasping and piercing