Brotar

Etymology
From Proto-Indo-European *bʰréh₂tēr (brother).

It has 3 meanings:
 * A male sibling.
 * A male having parents in common.
 * A male fellow member of a religious community.

Derived words

 * albrotar (n), brother-in-law.
 * brotarak (adj), fraternal.
 * brotarom (n), brotherhood.
 * kibrotar (n), step-brother.