Noun:

1. an amoeba-like protozoan with a chitinous shell resembling an umbrella

Arcan阿尔坎arcn.弧；弧形物vi.形成电弧；按弧形轨迹行进arc suppressing coil消弧线圈arc spraying process电弧喷涂工艺arc-control device电弧控制器件,灭弧装置Arc cylindrical gear弧齿圆柱齿轮arcuate hypothalamus弓形下丘脑arcuate line of ilium髂骨弓形线Arcocellulus mammifern.乳头弧眼藻Arctornis xanthochilan.莹白毒蛾Arc-slot Connection弧形短槽连接法arc welding generator弧焊发电机,电弧焊接用发电机