Word: stepbrother
Part of speech: Noun
Syllables: step
broth
er
Definition: The son of one's stepparent who is not the son of either of one's biological parents.
Morphemes:
Affix: step-
Language: en
PoS: Prefix
Meaning: A prefix used before father, mother, brother, sister, son, daughter, child, and so forth, to indicate that the person being identified is not a blood relative but is related through the marriage of a parent.
Affix: brother
Language: en
PoS: Noun
Meaning: Son of the same parents as another person.