ἥμισυ

English (Strong)

neuter of a derivative from an inseparable prefix akin to ἅμα (through the idea of partition involved in connection) and meaning semi-; (as noun) half: half.

ἥμῐσυ:
I τό (sc. μέρος) половина (τοῦ στρατοῦ Thuc.): ἥ. οὗ δεῖ Plat. половина того, что нужно.
II adv. пополам Hes., Pind.