thesis / theses
Singular thesis vs. plural theses, and the English-style plural thesises.
Thesis is the singular. Theses is the plural. Do not use thesises.
Examples
UseHer thesis is short.
UseTheir theses are short.
AvoidTheir thesises are short.
Singular thesis vs. plural theses, and the English-style plural thesises.
Thesis is the singular. Theses is the plural. Do not use thesises.
UseHer thesis is short.
UseTheir theses are short.
AvoidTheir thesises are short.