lasso-cell

from The Century Dictionary.

• noun One of the peculiar filiferous cell-like structures of cœlenterates, endowed with ability to throw out with astonishing rapidity the contained thread, which has the property of exciting a stinging or pricking feeling on sentient surfaces; an urticating organ; a nematocyst or thread-cell; a cnidocyst or cnida; a nettling-cell. See cut under cnida.