What does chlorophyllous mean?
Chlorophyllous is an adjective used almost exclusively in botanical and biological contexts to describe anything that contains or is characterized by chlorophyll, the green pigment that enables plants, algae, and some bacteria to perform photosynthesis. A chlorophyllous cell, tissue, or organism is therefore green and able to convert light energy into chemical energy. The word functions as a precise alternative to looser terms such as 'green' or 'photosynthetic', allowing scientists to specify exactly why a structure is green — because it houses chlorophyll — rather than merely noting its colour. Its opposite is sometimes given as 'achlorophyllous', describing structures that lack the pigment, such as the white stems of parasitic plants or fungal hyphae. Because it belongs to formal scientific vocabulary, chlorophyllous rarely appears in casual conversation, but it is a useful term for anyone reading plant physiology, ecology, or descriptive botany, where exactness about pigment and function matters more than poetic description of colour.
Containing or characterized by the presence of chlorophyll; green and capable of photosynthesis.
"Only the chlorophyllous layers of the stem contribute to its energy production."
Primarily a technical term in botany and biology.
Relating to, resembling, or of the nature of chlorophyll.
"The researchers compared the chlorophyllous properties of shade-grown and sun-grown leaves."
Swap one suffix and 'chlorophyll' goes from the pigment in every green leaf you've ever seen to the scientific adjective botanists use to describe them.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of chlorophyllous
Chlorophyllous derives from 'chlorophyll', the name of the green plant pigment coined in the early nineteenth century from Greek roots: 'chlōros' meaning pale green or yellowish-green, and 'phyllon' meaning leaf. The English suffix '-ous' was added to turn the pigment's name into an adjective meaning 'containing or relating to chlorophyll'. The same Greek root 'chlōros' gives us other scientific terms including 'chlorine' (named for the gas's pale green colour), 'chloroplast', and 'chlorosis'.
How chlorophyllous is actually used
A technical term found chiefly in botany and biology writing rather than everyday speech. It carries a neutral, scientific register and is typically applied to plant cells, tissues, organs, or organisms.
Easily confused with chlorophyllous
Chlorophyll is the green pigment itself (a noun), while chlorophyllous describes something that contains or relates to that pigment (an adjective).