名詞 vein:

1. a blood vessel that carries blood from the capillaries toward the heart
   同義詞：vena, venous blood vessel
2. a distinctive style or manner
3. any of the vascular bundles or ribs that form the branching framework of conducting and supporting tissues in a leaf or other plant organ
   同義詞：nervure
4. a layer of ore between layers of rock
   同義詞：mineral vein
5. one of the horny ribs that stiffen and support the wing of an insect
   同義詞：nervure

動詞 vein:

1. make a veinlike pattern

1. The act or practice of opening a vein by incision or puncture to remove blood as a therapeutic treatment.
   靜脈切開術(shù)，放血術(shù)切割靜脈或穿孔來放血的行為或?qū)嵺`，作為一種醫(yī)學(xué)治療
2. There is a vein of melancholy in his character.
   他的性格中有少許憂郁的氣質(zhì)。
3. I am not in the vein for work.
   我沒有心情工作。

vein

n.（名詞）

Anatomy Any of a branching system of membranous tubes that carry blood to the heart.
【解剖學(xué)】 靜脈：把血帶到心臟的支狀膜性管系統(tǒng)之一
A blood vessel.
血管
Botany One of the vascular bundles or ribs that form the branching framework of conducting and supporting tissues in a leaf or other expanded plant organ.Also called nervure
【植物學(xué)】 葉脈：維管束或主葉脈之一，形成傳導(dǎo)和支撐一片葉子中的組織或其它擴(kuò)展的植物器官的支狀結(jié)構(gòu)也作 nervure
Zoology One of the horny ribs that stiffen and support the wing of an insect.Also called nervure
【動物學(xué)】 翅脈：穩(wěn)固并支撐昆蟲的翅膀的角質(zhì)翅脈之一也作 nervure
Geology A regularly shaped and lengthy occurrence of an ore; a lode.
【地質(zhì)學(xué)】 礦脈：某種礦石的形狀規(guī)則而且漫長的出現(xiàn)；礦脈
A long, wavy strip of a different shade or color, as in wood or marble, or as mold in cheese.
紋理；紋路；條紋：不同色度或顏色的波浪形長條，如在木材或大理石中，或在干酪中形成的紋理
A fissure, crack, or cleft.
裂縫；縫隙；裂紋
A pervading character or quality; a streak:
氣質(zhì)；傾向；特色；風(fēng)格：一種遍布的特征或素質(zhì)；個人特色：
例句：
.All through the interminable narrative there ran a vein of impressive earnestness.(Mark Twain)See Synonyms at streak
.在這冗長的敘述中從頭到尾都有一種感人的、誠摯的風(fēng)格.(馬克·吐溫)參見 streak

A transient attitude or mood.
情緒：一時的態(tài)度或情緒
A particular turn of mind:
心境的起伏：思想的某一特殊轉(zhuǎn)變：
例句：
spoke later in a more serious vein.
后來以一種更嚴(yán)肅的心境講話

v.tr.（及物動詞）
veined,vein.ing,veins
To supply or fill with veins.
使有脈絡(luò)或紋理
To mark or decorate with veins.
用脈絡(luò)或紋理標(biāo)記或裝飾

來源：
Middle English veine
中古英語 veine
from Old French
源自 古法語
from Latin vôna
源自 拉丁語 vôna

【引伸】
vein.al
adj.（形容詞）