A position in Rugby football in the back line.

plural of second five-eighth

plural of first five-eighth

(idiomatic) Used as an excuse for drinking alcoholic beverages outside of customary hours.

Alternative spelling of fivepin bowling

(chemistry) Synonym of Lipinski's rule of five

(chemistry) A rule of thumb stating that a chemical compound is likely to be an orally active drug in humans unless it violates more than one of these criteria: (i) no more than 5 hydrogen bond donors (the total number of nitrogen–hydrogen and oxygen–hydrogen bonds); (ii) no more than 10 hydrogen bond acceptors (all nitrogen or oxygen atoms); (iii) a molecular mass less than 500 daltons; (iv) an octanol-water partition coefficient (log P) that does not exceed 5.

(medicine) Trench fever.

plural of five-day week

A working week of five days, the remaining two days in the week being rest days.