棘 (w)

(jí) thorns

棘手 (w)

(jíshǒu) thorny (problem); intractable

棘楚 (w)

(jíchǔ) thorny problem; troublesome affair

棘皮动物 (w)

(jípídòngwù) echinoderm, the phylum containing sea urchins, sea cucumbers etc

棘轮 (w)

(jílún) ratchet

棘鼻青岛龙 (w)

(jíbíqīngdǎolóng) Tsintaosaurus spinorhinus, a 10 meter long hadrosaur with a single horn on its duck-billed snout