Word (well, suffix) of the Day

-aceae · ei`-si-ei · noun plural suffix (technical; Botany)

: plants of the nature of a type genus, e.g. Rosaceae, "plants like roses;" standard suffix in names of families of plants. Some older family names which did not follow this form have been supplanted with new, conforming names: e.g., the former Leguminosae (pea family), is now the Fabaceae, after the genus Faba.

Etymology: New Latin, from Latin, feminine plural of -aceus "–aceous."
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Today’s word is not properly a word, of course, but a latinate suffix.