There are 2 definitions of Sn in English:

Sn1

Syllabification: Sn

symbol

The chemical element tin.

Origin

from late Latin stannum 'tin'.

Definition of Sn in:

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

There are 2 definitions of Sn in English:

SN2

Line breaks: SN

Entry from British & World English dictionary

abbreviation

Senegal (international vehicle registration).

Definition of Sn in: