Daddy longlegs : An arachnidan of the genus Phalangium, and allied genera, having a small body and four pairs of long legs; -- called also harvestman, carter, and grandfather longlegs.

Daddy longlegs : A name applied to many species of dipterous insects of the genus Tipula, and allied genera, with slender bodies, and very long, slender legs; the crane fly; -- called also father longlegs.

Example:


Taxonomy
spiders, daddy-longlegs, myth, fangs, Daddy Long Legs, humans, abdomen, bite, common name, daddy-long-legs, body parts, general public, too short, body segment, venom glands, poisonous spiders, Opiliones, segmentation.

Defination from the web:
Explains that though they are poisonous spiders, their fangs are too short to bite humans.