Relating to or characteristic of grass; of or pertaining to the grass family or members of Gramineae.
From Latin 'gramen' (grass) plus the adjectival suffix '-eal.' This is a less common variant form of 'graminaceous' or 'gramineous,' appearing mostly in specialized botanical texts.
This is an ultra-specialized botanical adjective—so rare that even many botanists prefer the more common 'graminaceous,' but it shows how English loves creating multiple words for the same concept!
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