biogen - a hypothetical protein molecule, large and unstable, once assumed to be basic to fundamental biological processes.
biostatics - the branch of biology dealing with the structure of organisms in relation to their functions
biostatistics - the application of statistics to biological and medical data.
bippy - an unspecified part of the anatomy (usually used in the phrase You bet your (sweet) bippy).
bird farm - an aircraft carrier.
Because that's the first thing that comes into your mind when you think "bird farm"
Birds, the - a comedy (414 b.c.) by Aristophanes.
Alfred Hitchcock's remake really failed to capture the spirit of humor in the original.
bissextus - February 29th: the extra day added to the Julian calendar every fourth year (except those evenly divisible by 400) to compensate for the approximately six hours a year by which the common year of 365 days falls short of the solar year.