Third-person singular simple present indicative form of elder

to remove the hull (covering of a seed or fruit)

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.

(organic chemistry) An imide acid, C₁₂H₄N₂O₈, that turns dark blue on reduction.