<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31471323</termId><termName>tusk</termName><termType>PT</termType><termNote><![CDATA[ General term for material made from tusks, which are large protruding teeth found in elephants, walruses, narwhals, and boars. Tusks, like other teeth, have a soft center surrounded by hard dentin primarily composed of calcium hydroxyapatite with smaller amounts of calcium carbonate, calcium fluoride, magnesium phosphate, and ossein. A hard durable enamel forms a smooth outer surface. Tusk has been used to make sculptures, handles, and other items. ]]></termNote><termCreatedDate>2026-03-30 21:06:51</termCreatedDate><relation><relationType>UF</relationType><termId>31471324</termId><termName>tusks</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31457679</termId><termName>tooth</termName><termType>PT</termType></relation><relation><relationType>RT</relationType><termId>31303798</termId><termName>tusks</termName><termType>PT</termType></relation></term>  </Zthes>