dol·phin

[dol-fin, dawl-]
noun
1.
any of several chiefly marine, cetacean mammals of the family Delphinidae, having a fishlike body, numerous teeth, and the front of the head elongated into a beaklike projection.
2.
Also called dolphinfish, mahimahi, pompano dolphin. either of two large, slender fishes, Coryphaena hippurus or C. equisetis, of warm and temperate seas.
3.
Nautical.
a.
a pile, cluster of piles, or buoy to which a vessel may be moored in open water.
b.
a cluster of piles used as a fender, as at the entrance to a dock.
c.
a pudding fender at the nose of a tugboat or on the side of a vessel.
4.
(initial capital letter) Astronomy. the constellation Delphinus.

Origin:
1300–50; Middle English dolphyn < Old French daulphin < Old Provençal dalfin < Vulgar Latin *dalfīnus, Latin delphīnus < Greek delphī́n

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Dolphin is always a great word to know.
So is interrobang. Does it mean:
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
Collins
World English Dictionary
dolphin (ˈdɒlfɪn) [Click for IPA pronunciation guide]
 
n
1.  any of various marine cetacean mammals of the family Delphinidae, esp Delphinus delphis, that are typically smaller than whales and larger than porpoises and have a beaklike snout
2.  river dolphin any freshwater cetacean of the family Platanistidae, inhabiting rivers of North and South America and S Asia. They are smaller than marine dolphins and have a longer narrower snout
3.  Also called: dorado either of two large marine percoid fishes, Coryphaena hippurus or C. equisetis, that resemble the cetacean dolphins and have an iridescent coloration
4.  nautical a post or buoy for mooring a vessel
 
[C13: from Old French dauphin, via Latin, from Greek delphin-, delphis]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

dolphin
c.1350, from O.Fr. daulphin, from M.L. dolfinus, from L. delphinus "dolphin," from Gk. delphis (gen. delphinos) "dolphin," related to delphys "womb," probably via notion of the animal bearing live young. Popularly applied to the dorado from late 16c.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Furthermore, the matched whistle will allow for a more natural integration of
  communication into the dolphin's speech.
The former is a one-day program focusing on dolphin care and feeding, with
  plenty of close interaction.
But whatever the fate of tuna, dolphin reproductive potential is not high.
The spinner dolphin is a small dolphin that lives in open ocean and coastal
  waters.
Images for dolphin
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