Apedia

 An Ear Heart Auricle Noun Atrium B C

Title Auricle
Text
Merriam-Webster's Collegiate Dictionary
au·ri·cle
 \\ˈȯr-i-kəl\\ noun
 ETYMOLOGY  Latin auricula, from diminutive of auris ear — more at 
ear
 DATE  15th century
1.
  a. an atrium of a heart
  b. 
pinna
 1

  c. an anterior ear-shaped pouch in each atrium of the human heart
2. an angular or ear-shaped lobe, process, or appendage
English Etymology
auricle
  1650s, from L. auricula "ear," dim. of auris (see ear (1)). Technically the external ear only or the lower lobe of it.
Oxford Advanced Learner's Dictionary-牛津双解-OALD7
auricle
aur·icle 5C:rikl / noun(anatomy 解) 
1. either of the ten upper spaces in the heart used to send blood around the body
   心耳
   SYN  
atrium
 
 compare 
ventricle
 (1) 
2. the outer part of the ear
   耳廓
Webster's Third New International Dictionary, Unabridged
au·ri·cle
\ˈȯrə̇kəl, -rēk-\ noun
(-s)
Etymology: Latin auricula, diminutive of auris ear — more at 
ear

1. 
 a. : the pinna of the ear
 b. [so called from a resemblance to the external ear of some quadrupeds] : an atrium of the heart
 c. : 
auricular appendage

2. : an angular or earlike lobe or process: as
 a. : one of the plates of the jaw to which the jaw muscles are attached in certain sea urchins with jaws
 b. : one of a pair of ciliated pitlike organs eversible for swimming in certain rotifers
 c. : either of the wings at the hinged border of the shell in certain bivalve mollusks (as the scallop)
3. : an ear-shaped appendage (as that at the base of the leaf blade of many grasses)
• au·ri·cled \-ld\ adjective

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