i Register
In some senses, thru is marked as informal, US, UK, rare. Watch for register when choosing this word.
ADJ.
common, primary
The primary reason we went thru that whole ordeal was to help our friend.
VERB + THRU
define, passing
We defined our relationship thru a long conversation last weekend.
THRU + NOUN
embryo, preimplantation, sludge
The doctor examined the preimplantation embryo thru the microscope before transferring it.
PREP.
from, without
We drove thru the night without stopping for rest.
ADV.
explicitly
She explicitly explained the process thru a detailed step-by-step video tutorial.