A person who is bisexual. / (botany, rare) A plant or fungus, or part thereof, which is bisexual. / (chiefly biology) An organism (that is, a species) which has male and female sexes.

plural of adhesion

The quality of being tetrahedral.

(dialectal) a wheel, especially of a wheelbarrow. / A piece of wood, etc., laid between the cords and boards of a book to flatten before cutting.