1. Out of bed
   "are they astir yet?"
   - up 
2. On the move
   "the whole town was astir over the incident"
   - about

See also: active, awake

• vena sacralis
• vena saphena
• vena scapularis dorsalis
• vena scrotalis
• vena sigmoideus
• vena spinalis
• vena sternocleidomastoidea
• vena stylomastoidea
• vena subclavia
• vena sublingualis
• vena supraorbitalis
• vena supratrochlearis
• vena temporalis
• vena testicularis
• vena thoracica
• vena thoracoepigastrica
• vena thyroidea
• vena tibialis
• vena trachealis
• vena ulnaris
• vena umbilicalis
• vena vertebralis
• vena vertebralis accessoria
• vena vertebralis anterior
• vena vesicalis