This is Lewis's "An Elementary Latin Dictionary (1890)", an abridgment of his larger "A Latin Dictionary for Schools (1888)" which in turn was an adaptation of the Full L&S.
(1) Prefix search for all headwords
(2) Full text search by keyword for all of the dictionary entries
(3) Completely offline! After the first license check the app remembers your device.
If you are interested in the unabridged L&S then see my corresponding app!