1. Thorn: tara miro. 2. Spur: tara moa. 3. Corner; te tara o te hare, corner of house; tara o te ahu, corner of ahu. Vanaga.

(1. Dollar; moni tara, id.) 2. Thorn, spike, horn; taratara, prickly, rough, full of rocks. P Pau.: taratara, a ray, a beam; tare, a spine, a thorn. Mgv.: tara, spine, thorn, horn, crest, fishbone. Mq.: taá, spine, needle, thorn, sharp point, dart, harpoon; taa, the corner of a house, angle. Ta.: tara, spine, horn, spur, the corner of a house, angle. Sa.: tala, the round end of a house. Ma.: tara, the side wall of a house. 3. To announce, to proclaim, to promulgate, to call, to slander; tatara, to make a genealogy. P Pau.: fakatara, to enjoin. Mq.: taá, to cry, to call. 4. Mgv.: tara, a species of banana. Mq.: taa, a plant, a bird. Ma.: tara, a bird. 5. Ta.: tara, enchantment. Ma.: tara, an incantation. 6. Ta.: tara, to untie. Sa.: tala, id. Ha.: kala, id. Churchill.

4. Mgv.: tara, a species of banana. Mq.: taa, a plant, a bird.

Not every tara means a 'thorn'. Instead, I suspect, the idea is a bird which announces (tara) a new season.

... The arrival and the nesting of these birds at the beginning of the southern spring was the high point of the year ... (Barthel 2)