单词	venation
释义	venation /vɪˈneɪʃ(ə)n / noun [mass noun] Biology 1The arrangement of veins in a leaf or in an insect’s wing.Reticulate leaf venation may also provide physiological advantages in forest understories.... They produced several types of foliage all characterized by pinnate leaves with open dichotomous venation. Leaves have parallel venation, with veins converging at the tip of the leaf. 1.1The system of venous blood vessels in an animal. Derivatives venational adjective ... Most Paleozoic insects are known only by their wing venation since wings are the least degradable parts of insects, so phylogenetic schemes will rely on venational characters. They differ from some of the more slender Palaeodictyoptera of the time, which they otherwise resembled, chiefly in venational characters and in possessing a long caudal style. Origin Mid 17th century: from Latin vena 'vein' + -ation.
随便看	new federalist Newfie Newfie joke new-fledged New Forest New Forest Burnet New Forest cicada New Forest disease New Forest pony new-formed new-for-old new-found Newfoundland Newfoundland and Labrador Newfoundland dog Newfoundlander Newfoundland fish Newfoundlandic New France new frontier New Frontiersman febrifuge febrile febrilely febrility

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