bot·fly also bot fly 
(bŏtflī′)
(bŏtflī′)n.
Any of various stout dipteran flies of the family Oestridae, having larvae that are parasitic on mammals, including livestock and sometimes humans.
- unscientific
- unscientifically
- unscramble
- unscrambler
- unscrew
- unscripted
- unscrupulous
- unscrupulously
- unscrupulousness
- unseal
- downspin
- downspout
- Down's syndrome
- Down's syndrome
- downstage
- downstairs
- downstate
- downstater
- downstream
- downswing
- Down syndrome
- down the drain
- down the hatch
- down the line
- down the road