American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "sentinel" in a sentence
"I do have a veterinarian friend who has what he calls a sentinel cat."
"Lieutenant Hayward treated him with a sort of contemptuous look, and began to enter into conversation with him respecting the _Bounty_, but I called the sentinel in to take them into custody, and ordered Lieutenant"
""Oh, this isn't a co-op exactly, and it's not like, uh, the Guardian Angels, except for what they call sentinel stance, and - It's sort of like a church, except not that either."