There are 2 definitions of Mx in English:

Mx1

Line breaks: Mx

abbreviation

1Maxwell(s).
1.1Middlesex.

Definition of Mx in:

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Word of the day animalcule
Pronunciation: ˌanɪˈmalkjuːl
noun
a microscopic animal

There are 2 definitions of Mx in English:

MX2

Syllabification: MX

Entry from US English dictionary

abbreviation

Missile experimental (a US intercontinental ten-warhead ballistic missile).

Definition of Mx in: