the effective diameter of the primary lens, mirror, or antenna of a telescope

listen to the pronunciation of the effective diameter of the primary lens, mirror, or antenna of a telescope
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Aperture
the effective diameter of the primary lens, mirror, or antenna of a telescope

    Heceleme

    the ef·fec·tive di·am·e·ter of the pri·ma·ry lens, mirror, or an·ten·na of a te·le·scope

    Telaffuz