毫米(法语:millimètre;英式英文:millimetre,美式英文:millimeter),符号mm,是长度单位。1毫米相当于千分之一米(10-3,此即为“毫”个字义),或十分之一厘米。
拉摄影范畴中,底片个制式以毫米为单位,有辰光会称为“米厘”,例如“8米厘电影”即为“8毫米电影”。
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