Mamma
Part of speech: noun
Definition: The milk-secreting organ of female humans and other mammals which includes the mammary gland and the nipple or teat; a breast; an udder. Plural: mammae Another term for mama or mother. Plural: mammas an accessory cloud like a mammary in appearance, which can form on the underside of most cloud genera
Ma
Part of speech: acronym
Definition: milli-second of arc
Part of speech: abbreviation
Definition: Maymegannum. One million years.
Part of speech: noun
Definition: Mother, mama.
Example sentence: I spent two years in Palo Alto - what an awful, suffocating place for those of us who don't care about yoga, yogurts and start-ups - and now I have moved to Cambridge, MA - which, in many respects, is like Palo Alto but a bit snarkier.