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单词 excalation
释义

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excaˈlation
excaˈlation n. the omission, absence, or elimination of a part from the middle of a series; spec., in a race of organisms, the absence of any part, such as one of the middle digits or one of the vertebræ.
ΘΚΠ
the world > space > place > removal or displacement > [noun] > of a part from a series
excalation1898
1898 Nature 22 Dec. 171/2 Kükenthal's discovery of excalation of fingers in the Cetacea.
1900 Philos. Trans. (Royal Soc.) B. 193 343 Hence the supposition of excalation of vertebræ in front of the girdle [of Mustelus vulgaris] leads also to the necessary corollary that a vast amount of both inter- and excalation must go on at another spot.
extracted from excalatev.
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