Akademik

tittie
noun also titty \\ˈtiti\ (plural titties)
Etymology: probably baby talk alteration of sister (I)
chiefly Scotland : sister; also : a young girl or woman

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/tit"ee/, n. Scot. Informal.
titty1.

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tittie
variant of titty n.1 and n.3

Useful english dictionary. 2012.