shelter: [16] The origins of shelter are unclear, but the most usually accepted explanation is that it is an alteration of the now obsolete sheltron. This denoted a body of troops which protected itself in battle with a covering of joined shields. It was descended from Old English scieldtruma, a compound formed from scield, the ancestor of modern English shield, and truma ‘troop’. => shield[shelter etymology, shelter origin, 英语词源]