[1] : The Collaborative International Dictionary of English v.0.48

sentinel \sen"tinel\, 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.
   1. 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. --macaulay.
      1913 webster

   2. watch; guard. obs. "that princes do keep due sentinel."
      --bacon.
      1913 webster

   3. zool. a marine crab podophthalmus vigil native of
      the indian ocean, remarkable for the great length of its
      eyestalks; -- called also sentinel crab.
      1913 webster
see also:
sentry podophthalmus vigil sentinel crab 

Sentinel >> S Words
Sentinel, definition of term: Sentinel
sentinel_pag1.html

Crab >> C Words
Crab, definition of term: Crab
crab_pag1.html

Crab Louse >> C Words
Crab Louse, definition of term: Crab Louse
crab+louse_pag1.html

Crab Nebula >> C Words
Crab Nebula, definition of term: Crab Nebula
crab+nebula_pag1.html

Crab Cactus >> C Words
Crab Cactus, definition of term: Crab Cactus
crab+cactus_pag1.html

Crab Apple >> C Words
Crab Apple, definition of term: Crab Apple
crab+apple_pag1.html

Kelp Crab >> K Words
Kelp Crab, definition of term: Kelp Crab
kelp+crab_pag1.html

King Crab >> K Words
King Crab, definition of term: King Crab
king+crab_pag1.html

Jonah Crab >> J Words
Jonah Crab, definition of term: Jonah Crab
jonah+crab_pag1.html

Fiddler Crab >> F Words
Fiddler Crab, definition of term: Fiddler Crab
fiddler+crab_pag1.html

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