Tycho

American

[tahy-koh] / ˈtaɪ koʊ /

noun

a prominent crater in the third quadrant of the face of the moon, about 56 miles (90 km) in diameter.

Tycho British

/ ˈtaɪkəʊ /

noun

a relatively young crater in the SW quadrant of the moon, 4 km deep and 84 km in diameter, with a central peak. It is the centre of a conspicuous system of rays

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of Tycho

named after Tycho _Brahe

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

This process explains why ancient craters lack bright rays, while younger ones like Tycho, which formed about 108 million years ago, still display prominent streaks visible from Earth.

From Science Daily • Apr. 8, 2026

Lyons and others are being represented by Tycho & Zavareei, a leading consumer protection class-action law firm, as well as L.A.-based Clarkson Law.

From Los Angeles Times • May 22, 2023

You can see the biggest craters on the Moon by eye; Tycho is one of the most dramatic.

From Scientific American • Mar. 22, 2022

Tycho, about 82 kilometers in diameter, is one of the youngest of the very large lunar craters.

From Textbooks • Oct. 13, 2016

So Tycho worked out a table of corrections for the instrument from which he could read off the correct measurement corresponding to the incorrect reading obtained by the cross-staff for any observation he made.

From "The Scientists" by John Gribbin

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023