Having thorns or spines / (figuratively) Troublesome or vexatious / Aloof and irritable

The property of being thorny (of having thorns or metaphorically being difficult).

plural of thorniness

Any insect of the family Rachiberothidae.

plural of thorny lacewing

Any of the spiny bivalve molluscs of the genus Spondylus.

plural of thorny oyster

Glycera americana, a large slender species found in mud at low tide. Sometimes grows to 600 mm.

Calicotome spinosa, a spiny, densely branched shrub of the legume family.

plural of thorny broom