filiastra

From fīliaster (“stepson, son-in-law, nephew”) +‎ -a (suffix forming feminine counterparts of masculine nouns), or alternatively, from fīli(a) (“daughter”) +‎ -astra (suffix denoting partial resemblance).

• (Classical Latin) IPA^(key): [fiː.liˈas.tra]
• (modern Italianate Ecclesiastical) IPA^(key): [fi.liˈas.t̪ra]

fīliastra f (genitive fīliastrae, masculine fīliaster); first declension

1. stepdaughter
2. daughter-in-law
3. niece, sister's daughter

First-declension noun.

• filiaster