DLF

noun3

1. •
   Initialism of dead last finish or "dead last finisher"; the act of completing a race but coming in last, the person who completed a race in last place.
2. •
   Initialism of digitalis-like factor, a substance found to be elevated in the blood serum of hypertensive mammals with a digoxin-like immunoreactivity.

   • It was the opinion of first investigators that DLF originated in the brain [16], more precisely, in the hypothalamus [17–19] and adenohypophysis [20]. — 2012
3. •
   Initialism of direct lytic factor, a peptide found in cobra venom

   • This is a curiously weak effect by the DLF alone, but it is extremely magnified by phopholipase A ^([sic]) and even more by phospholipase A plus calcium ion. — 2001