What does membranaceous mean?
Membranaceous is a formal adjective describing something that consists of a membrane or has a membrane-like character. Its uses are chiefly biological and anatomical: a membranaceous layer may form a delicate boundary around an organ or organism, protect underlying tissue, or permit the movement of particular substances. The word is less common than the closely related membranous, which can serve most general purposes, but membranaceous can be especially appropriate when an object's appearance or construction is being compared to that of a membrane. Because it is a technical term, it is likely to appear in scientific descriptions, specialist writing, and formal reference works rather than everyday speech. The suffix -aceous also occurs in many adjectives describing resemblance, composition, or natural texture, while the stem membran- supplies the specific reference to a membrane.
adjectiveMembranaceous means consisting of, resembling, or having the character of a membrane. It is used chiefly in biological and anatomical contexts.
- Consisting of or resembling a membrane, especially a thin, flexible biological structure.
"The larva has a delicate membranaceous outer covering that permits it to breathe in the water."
"A thin membranaceous layer surrounds the organism."
"The scientist examined the membranaceous tissue under a high-powered microscope."
Some of the body's most delicate boundaries are membranaceous: thin, translucent structures that separate, protect, or allow substances to pass.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does membranaceous come from?
Membranaceous was formed in the early 19th century from the stem membran-, meaning “of or relating to a membrane,” together with the suffix -aceous, which forms adjectives indicating resemblance, composition, or quality. The stem derives from Latin membrana, a thin skin or covering, ultimately from the Latin root mens-, meaning “skin.” The related English word membranous follows the same Latin source, as does the botanical term membranule for a small membrane.
Related word forms
How membranaceous is actually used
This is a specialized formal adjective, used primarily in biology, anatomy, zoology, and botany. In general writing, membranous is usually more familiar and more natural.
Easily confused with membranaceous
Both terms refer to a membrane, but membranous is the more common general term, whereas membranaceous more specifically suggests a membrane-like character or appearance.