Having or producing cotyledons; containing or characterized by seed leaves.
From cotyledon + -ous (adjective-forming suffix indicating 'full of' or 'characterized by'). The -ous ending is one of the most productive adjective suffixes in English, from Latin.
The -ous suffix is so productive that we use it for everything from 'fabulous' to 'rebellious,' and adding -ous to cotyledon makes it instantly describable—it's how English users unconsciously follow rules they've never learned.
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