plural of rubbing post

Toxicodendron rydbergii, an ivy-like species of Toxicodendron common in the western United States, well-known for its ability to causes an itching rash and blistering for most people, through urush...

(zoology, rare) Having the intrinsic muscles of the larynx attached to the middle of the semirings.

simple past tense and past participle of crack