-köpfig
-member
Used as a suffix in adjectives to indicate the number of people or members in a group.
Die vierköpfige Familie sucht eine größere Wohnung.
The family of four is looking for a larger apartment.

-headed / -member
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-member
Used as a suffix in adjectives to indicate the number of people or members in a group.
Die vierköpfige Familie sucht eine größere Wohnung.
The family of four is looking for a larger apartment.

The word '-köpfig' is not an independent vocabulary item, but a suffix that is attached to another word. It is derived from the noun 'der Kopf' (head) and is used to form adjectives.
Die Band ist dreiköpfig und besteht aus Gitarre, Bass und Schlagzeug.
The band has three members and consists of guitar, bass, and drums.
To indicate the size of a group of people, combine a number with '-köpfig'. The adjective formed in this way is then declined before the noun like any other adjective.
Ein fünfköpfiges Gremium entscheidet über die Vergabe der Preise.
A five-member committee decides on the awarding of the prizes.
This form is often used to describe the number of members in groups. Typical nouns are: a family, a team, a group, a jury, or a band.
Für das Projekt wurde ein zehnköpfiges Team zusammengestellt.
A ten-member team was put together for the project.
In this meaning, '-köpfig' is combined with another word (often an adjective) to describe a character trait. Well-known examples are 'starrköpfig' (stubborn) or 'heißköpfig' (hot-headed/impulsive).
Er ist ein kluger, aber manchmal etwas heißköpfiger Debattierer.
He is a clever but sometimes somewhat hot-headed debater.