单词	pygidium
释义	pygidium /pʌɪˈdʒɪdɪəm / /pʌɪˈɡɪdɪəm/ noun (plural pygidia /pʌɪˈdʒɪdɪə/ /pʌɪˈɡɪdɪə/) Zoology The terminal part or hind segment of the body in certain invertebrates.The pygidium, like the cephalon, was a structure in which segments were fused together.... A pygidium with an attached thoracic segment represents a meraspid stage of the species. By contrast, some representatives of the Olenelloidea have pygidia with multiple segments. Origin Mid 19th century: modern Latin, from Greek pugē 'rump'.
随便看	have something to offer have something to one's credit have something to say for oneself have stars in one's eyes have steam coming out of one's ears have swallowed a dictionary have the advantage of have the better of have the courage of one's convictions have the drop on have the face to do something have the goodness to do something have the heart to do something have the hots for have the last laugh have the legs of have the neck to do something have the pleasure of something (or of doing something) have the time have the wood on have tickets on oneself have to hand it to someone have to one's name have two left feet have what it takes

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