bi- + sweep (“rowing style in which each rower has only one oar and rows on one side”) + -ual, in analogy to bisexual.
bisweptual (not comparable)
- (US, rowing) Able to row sweep on either port or starboard with equal or near-equal proficiency.
bisweptual (plural bisweptuals)
- (US, rowing) A person who is bisweptual.