Relating to or concerning the gonads or reproductive glands.
From gonad (Greek gonos 'seed') + -al (Latin suffix forming adjectives). This is a straightforward adjectival form derived from the noun gonad.
While 'gonadal' is much more common in modern English, 'gonal' shows up in older scientific papers—it's one of those shorter forms that languages sometimes try out before settling on a standard!
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