step·broth·er

[step-bruhth-er]
noun
one's stepfather's son or stepmother's son by a previous marriage.

Origin:
1400–50; late Middle English; see step-, brother

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World English Dictionary
stepbrother (ˈstɛpˌbrʌðə) [Click for IPA pronunciation guide]
 
n
a son of one's stepmother or stepfather by a union with someone other than one's father or mother respectively

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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00:10
Stepbrother is always a great word to know.
So is flibbertigibbet. Does it mean:
a chattering or flighty, light-headed person.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
Example sentences
Sometimes on the weekends, my older stepbrother and stepsister live with us, too.
The stepfather, stepmother, stepbrother or stepsister.
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