What does extracellularly mean?
Extracellularly is a technical adverb meaning “outside a cell” or “outside cellular boundaries.” It is the natural grammatical form of extracellular and is commonly used in biology, medicine, and biochemistry to describe where substances are released, transported, or observed. For example, a signaling molecule may be secreted extracellularly, entering the space between cells rather than remaining inside the cell that produced it. The opposite term, intracellularly, describes something occurring within a cell. Extracellularly can also distinguish material lying outside individual cells from material contained within them. The word is formal and specialized rather than everyday vocabulary, but it is useful whenever precision about cellular location matters. Its meaning is relatively straightforward: the prefix extra- adds the sense “outside,” while cellular supplies “relating to cells.” Understanding the term helps readers follow discussions of extracellular vesicles, signaling pathways, and the extracellular matrix.
adverbOutside a cell or its boundaries, rather than within the cell. It is used especially in biology, medicine, and biochemistry to describe the location or movement of substances.
- Outside a cell or cellular boundary, especially with reference to the location, movement, or secretion of a substance.
"The signaling protein is secreted extracellularly, allowing it to act on neighboring cells."
"The drug is released extracellularly and then taken up by nearby cells."
"Fluorescent tracers remained extracellularly, indicating that they had not entered the neurons."
Sometimes the most important cellular conversation happens outside the cell: extracellularly describes where those messages are released and heard.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does extracellularly come from?
Extracellularly was formed by adding the adverbial suffix -ly to extracellular, which combines extra- with cellular. Extra- comes from Latin extra, meaning “outside,” while cellular derives ultimately from Latin cellula, a diminutive of cella meaning “small room” or “cell.” Related English formations include intracellular, intercellular, multicellular, and unicellular; intracellular substitutes intra-, meaning “within,” for extra-.
How extracellularly is actually used
This is formal, specialized vocabulary used chiefly in scientific, medical, and technical writing. It is uncommon in everyday speech.
Easily confused with extracellularly
Extracellularly means outside a cell, whereas intracellularly means within a cell.