Green’s Dictionary of Slang

1. a religious dissenter; thus pantile-house, pantile-shop, a dissenters’ meeting house [the meeting houses of rural dissenters were often roofed with pantiles].

1785		Grose Classical Dict. of the Vulgar Tongue n.p.: Pantile house, a presbyterian, or other dissenting meeting house, frequently covered with pantiles.
1796		Grose Classical Dict. of the Vulgar Tongue (3rd edn) n.p.: Pantile Shop. A presbyterian, or other dissenting meeting house, frequently covered with pantiles.
1811		Lex. Balatronicum [as cit. 1796].
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.
1856		H. Mayhew Great World of London 249: The officers used to designate the extraordinary religious convicts as pantilers .
1860		Hotten Dict. of Modern Sl. etc. (2nd edn) 186: PANTILER, a dissenting preacher.
1864		C. Knight Passages of Working Life (1873) I 217: The vulgar term of opprobrium for sectaries in the palmy days of ‘Church and King’ was ‘Pantilers’ .
1873		Sl. Dict.

2. a hat.

1860		Hotten Dict. of Modern Sl. etc. (2nd edn).
1864, 1867, 1870		Hotten Sl. Dict.
1873		Sl. Dict.

3. a hard biscuit, sometimes with jam spread on it.

1864, 1867, 1870		Hotten Sl. Dict.
1873		Sl. Dict.