What does prolate mean?
Prolate describes something that is stretched out or longer in one dimension than another. Its best-known use is in geometry and astronomy: a prolate ellipse is longer along its major axis than across its minor axis, and a prolate spheroid resembles an egg rather than a sphere. The word can also describe a duration that is prolonged or drawn out, although this general sense is less common and often sounds formal or old-fashioned. As a verb, prolate means to prolong or extend something, but modern speakers usually prefer prolong or extend. The term is especially useful when precision matters, since it distinguishes an elongated form from an oblate one, which is flattened or wider than it is tall. In scientific writing, prolate is more precise than merely long and avoids suggesting that the object is simply narrow in every respect.
Elongated or extended, especially longer along one axis than another; in geometry, describing an ellipse or spheroid that is stretched lengthwise.
"The object has a distinctly prolate shape rather than the nearly spherical form expected in the model."
Chiefly used in technical and scientific writing; in geometry and astronomy, it contrasts with oblate.
To prolong or extend the duration of something.
"The committee prolate the hearing until all the witnesses had been heard."
Uncommon and formal or archaic in modern English; prolong and extend are more usual.
Prolate describes the shape of a stretched egg: longer from end to end than around its middle.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does prolate come from?
Prolate comes from Latin prolatum, a form of prolatus meaning “carried forward” or “stretched out.” Prolatus was the perfect passive participle of proferre, “to bring forth,” formed from pro- (“forward”) and ferre (“to carry”). English adopted the word in senses connected with extending length or duration before its later technical use for elongated geometric forms.
How prolate is actually used
The adjective is most common in technical contexts, especially geometry, astronomy, and anatomy. The verb is uncommon and sounds formal or archaic.
Easily confused with prolate
A prolate shape is longer than it is wide, whereas an oblate shape is flattened or broader than it is tall.