There are 2 definitions of butty in English:

butty1

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Entry from British & World English dictionary

(also buttie)

noun (plural butties)

informal , chiefly Northern English
A filled or open sandwich: a bacon butty

Origin

mid 19th century: from butter + -y2.

Definition of butty in:

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Word of the day setose
Pronunciation: ˈsēˌtōs
adjective
bearing bristles or setae; bristly

There are 2 definitions of butty in English:

butty2

Line breaks: butty

Entry from British & World English dictionary

noun (plural butties)

British
1 informal (Among miners) a friend or workmate.
2 historical A middleman negotiating between miners and the mine owner.
3 (also butty boat) An unpowered freight barge intended to be towed.

Origin

late 18th century: probably from booty1 in the phrase play booty 'join in sharing plunder'.

Definition of butty in:

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Word of the day setose
Pronunciation: ˈsēˌtōs
adjective
bearing bristles or setae; bristly