It's a plural, but I'm not sure what. Perhaps it's because of the augmentative of pincer ("tweezer-like tool"), or because of some feminine version of tenazón ("quick, improvised, and untidy act") used as an adjective, or because of a feminine augmentative of the tenacious adjective ("firm, resilient").
* Only one "like" per meaning and day, the more "likes" the meaning will appear higher in the list
