Sentinel

• POS: Noun, Verb (transitive)
• HYPHEN: sen=ti=nel

CIDE DICTIONARY

Sentinel, n. [F. sentinelle (cf. It. sentinella); probably originally, a litle path, the sentinel's beat,, and a dim. of a word meaning, path; cf. F. sente path. L. semita; and OF. sentine, sentele, senteret, diminutive words. Cf. Sentry.].

•  One who watches or guards; specifically (Mil.), a soldier set to guard an army, camp, or other place, from surprise, to observe the approach of danger, and give notice of it; a sentry.  [1913 Webster]

  "The sentinels who paced the ramparts."  [1913 Webster]
•  Watch; guard.  Bacon.  [1913 Webster]
•  A marine crab (Podophthalmus vigil) native of the Indian Ocean, remarkable for the great length of its eyestalks; -- called also sentinel crab.  [1913 Webster]

Sentinel, v. t. 

•  To watch over like a sentinel.  Sir W. Scott.  [1913 Webster]
•  To furnish with a sentinel; to place under the guard of a sentinel or sentinels.  [1913 Webster]

OXFORD DICTIONARY

Sentinel, n. & v.
--n. a sentry or lookout.
--v.tr. (sentinelled, sentinelling; US sentineled, sentineling)
1 station sentinels at or in.
2 poet. keep guard over or in.

Etymology

F sentinelle f. It. sentinella, of unkn. orig.

ROGET THESAURUS

Sentinel

Safety

N safety, security, surety, impregnability, invulnerability, invulnerableness, danger past, danger over, storm blown over, coast clear, escape, means of escape, blow valve, safety valve, release valve, sniffing valve, safeguard, palladium, guardianship, wardship, wardenship, tutelage, custody, safekeeping, preservation, protection, auspices, safe-conduct, escort, convoy, guard, shield, guardian angel, tutelary god, tutelary deity, tutelary saint, genius loci, protector, guardian, warden, warder, preserver, custodian, duenna, chaperon, third person, watchdog, bandog, Cerberus, watchman, patrolman, policeman, cop, dick, fuzz, smokey, peeler, zarp, sentinel, sentry, scout, garrison, guardship, refuge &c, anchor, precaution, quarantine, cordon sanitaire, confidence, protect, take care of, preserve, cover, screen, shelter, shroud, flank, ward, guard, secure, entrench, intrench, fence round, house, nestle, ensconce, take charge of, escort, convoy, garrison, watch, mount guard, patrol, make assurance doubly sure, take up a loose thread, take precautions, double reef topsails, seek safety, take shelter, find shelter, Adj, safe, secure, sure, in safety, in security, on the safe side, under the shield of, under the shade of, under the wing of, under the shadow of one's wing, under cover, under lock and key, out of danger, out of the woods, out of the meshes, out of harm's way, unharmed, unscathed, on sure ground, at anchor, high and dry, above water, unthreatened, unmolested, protected, cavendo tutus, panoplied, snug, seaworthy, weatherproof, waterproof, fireproof, defensible, tenable, proof against, invulnerable, unassailable, unattackable, impenetrable, impregnable, imperdible, inexpugnable, Achillean, safe and sound, scathless, unhazarded, not dangerous, unthreatening, harmless, friendly (cooperative), protecting, protective, guardian, tutelary, preservative, trustworthy, ex abundanti cautela, with impunity, all's well, salva res est, suave mari magno, a couvert, e terra alterius spectare laborem, Dieu vous garde.

Warning

N warning, early warning, caution, caveat, notice, premonition, premonishment, prediction, contraindication, lesson, dehortation, admonition, monition, alarm, handwriting on the wall, mene mene tekel upharsin, red flag, yellow flag, fog-signal, foghorn, siren, monitor, warning voice, Cassandra, signs of the times, Mother Cary's chickens, stormy petrel, bird of ill omen, gathering clouds, clouds in the horizon, death watch, watchtower, beacon, signal post, lighthouse, sentinel, sentry, watch, watchman, watch and ward, watchdog, bandog, housedog, patrol, patrolman, vedette, picket, bivouac, scout, spy, spial, undercover agent, mole, plainclothesman, advanced guard, rear guard, lookout, cautiousness, monitor, guard camera, radar, AWACS, spy satellite, spy-in-the- sky, U2 plane, spy plane, warning, premonitory, monitory, cautionary, admonitory, admonitive, sematic, warned, forewarned, on one's guard, in terrorem, Int, beware!, ware!, take care!, look out!, fore (golf), mind what you are about!, take care what you are about!, mind!, ne reveillez pas le chat qui dort, don't wake a sleeping cat, foenum habet in cornu, caveat actor, le silence du people est la legon des rois, verbum sat sapienti, a word to the wise is sufficient, un averti en vaut deux.

Keeper

N keeper, custodian, custos, ranger, warder, jailer, gaoler, turnkey, castellan, guard, watchdog, watchman, Charley, chokidar, durwan, hayward, sentry, sentinel, watch and ward, concierge, coast guard, guarda costa, game keeper, escort, bodyguard, protector, governor, duenna, guardian, governess, nurse, nanny, babysitter, catsitter, dogsitter, bonne, ayah.

Spectator

N spectator, beholder, observer, looker-on, onlooker, witness, eyewitness, bystander, passer by, sightseer, rubberneck, rubbernecker, spy, sentinel.