What does dilatator mean?
Dilatator is a technical noun used primarily in anatomy and medicine to denote something that widens. Most commonly it refers to a muscle whose contraction enlarges an opening or organ — for instance, the dilatator of the pupil, which expands the iris's central aperture so more light can enter the eye. In surgical contexts the word can also denote an instrument designed to stretch or open a passage or cavity during a procedure. The term derives from the Latin verb dilatare, meaning 'to spread out' or 'enlarge', and shares its root with the everyday words dilate and dilation. Although fully standard, dilatator is less frequent than its shorter synonym dilator and is encountered chiefly in scholarly anatomical nomenclature, where Latin forms are traditionally retained. Its natural counterpart in meaning is the constrictor or sphincter, muscles that narrow rather than widen. Because of its specialized register, the word rarely appears in general conversation, but it remains precise and useful wherever the mechanics of muscular widening must be described accurately.
nounA muscle whose contraction widens or opens a body part or opening, such as the pupil of the eye; also, any instrument used for dilating a passage or cavity.
- A muscle that widens a bodily opening or organ (anatomy).
- An instrument designed to widen a passage or cavity (medicine/surgery).
- In entomology, a muscle that expands certain appendages such as the phallus.
"The iris contains a dilatator that enlarges the pupil in dim light."
"Damage to the pupillary dilatator can leave the eye unable to adjust to low light."
"The surgeon selected a graduated dilatator to gently widen the narrowed vessel."
The anglicized plural 'dilatators' is normal in general use; scholarly anatomy texts sometimes retain the Latin plural 'dilatatores'.
"The dissection manual labelled both pupillary dilatators on the diagram."
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of dilatator
Dilatator comes directly from Latin, formed on the verb dilatare ('to spread wide, enlarge'), itself from dis- ('apart') plus latus ('wide'), the same root that gives English latent and translate via related formations. The word entered scientific Latin as an agent noun — literally 'that which widens' — and was adopted into English anatomy in the early modern period alongside other Latin muscle names. Its cognates in modern English include dilate, dilation, and dilatory, all tracing back to the same Latin stem.
How dilatator is actually used
A formal, technical term found mainly in anatomy, surgery, and zoology; outside these fields the simpler form 'dilator' is preferred. The plural may be anglicized as 'dilatators' or given the Latin form 'dilatatores' in scholarly writing.
Easily confused with dilatator
Dilatator is a chiefly technical variant spelling of dilator, both denoting a widening muscle or instrument, but dilator is by far the more common form.