| Sentinel 1. (n.) One who watches or guards; a soldier set to guard a camp from surprise, to observe the approach of danger, and give notice of it; a sentry. 2. (n.) Watch; guard. 3. (n.) A marine crab (Podophthalmus vigil) native of the Indian Ocean, remarkable for the great length of its eyestalks; -- called also sentinel crab. 4. (v. t.) To watch over like a sentinel. 5. (v. t.) To furnish with a sentinel; to place under the guard of a sentinel or sentinels. Thesaurus Entries Druid, Eeyore, Jeremiah, admonisher, astrologer, augur, calamity howler, cautioner, crepehanger, crystal gazer, cynic, defeatist, divinator, diviner, divineress, flagman, forecaster, foreknower, foreseer, foreshower, foreteller, fortuneteller, geomancer, haruspex, killjoy, lighthouse keeper, lookout, lookout man, malist, monitor, negativist, nihilist, palmist, pessimist, predictor, prefigurer, presager, prognosticator, prophesier, prophet, prophet of doom, prophetess, psychic, pythoness, religious prophets, retreatist, seek-sorrow, seer, seeress, sentinel, sentry, signaler, signalman, soothsayer, vates, warner, weather prophet, worrywart |