I guess it is:
Main Entry: in?cus ()Pronunciation: 'i[ng]-k&sFunction: nounInflected Form(s): plural in?cu?des () /i[ng]-'kyü-(")dEz, 'i[ng]-ky&-"dEz/Etymology: New Latin, from Latin, anvil, from incudereDate: 1669: the middle bone of a chain of three small bones in the ear of a mammal -- called also anvil; see (dictionary?book=Dictionary&va=ear+)illustration
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I guess it is:
Main Entry: in?cus
Pronunciation: 'i[ng]-k&s
Function: noun
Inflected Form(s): plural in?cu?des
Etymology: New Latin, from Latin, anvil, from incudere
Date: 1669
: the middle bone of a chain of three small bones in the ear of a mammal -- called also anvil; see (dictionary?book=Dictionary&va=ear+)illustration