Noun:

1. (botany) the arrangement of veins in a leaf

2. (zoology) the system of venous blood vessels in an animal

venacn.聚乙酸乙烯酯树脂venan.静脉venae vestibulares前庭静脉venae pancreaticae胰静脉vena saphena parva小隐静脉vena nasofrontalis鼻额静脉venae iliolumbalis[医] 髂腰静脉vena cava anterior前腔静脉venae hypogastrica[医] 髂内静脉venae colica media[医] 中结肠静脉venae intestinales[医] 肠静脉vena intercostalis腮间静脉

1. Venation is the distribution of veins in a leaf.
   脉序是叶片中各叶脉的排列分布状态。