This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. Plural form of venule.

"Whether through dehydration or bad luck, a few red blood cells had started to sickle, the crescent moon-shaped cells becoming lodged within the smaller venules, creating ischemia and prompting the sickling of other cells in turn."