isogram

Everyday

1. An isogram is a word in which no letter appears more than once, such as «dog», «planet» or «uncopyrightable». tree →
2. (geography) An isogram is also a line on a map joining places that have the same value, such as the same temperature or height; isotherms and contour lines are kinds of isograms. tree →

In the lessons

In word puzzles, spelling games and olympiad problems pupils check whether a word repeats a letter; in geography it names lines on weather and height maps. Phrases: «is it an isogram?», «the longest isogram».

Examples

• «Lamp» is an isogram because no letter repeats. tree →
• «Letter» is not an isogram, because it has two t's and two e's. tree →
• Can you find a ten-letter isogram? tree →
• «Background» is an isogram. tree →
• We played a game to write the longest isogram. tree →
• On the weather map, an isogram joined places with the same temperature. tree →
• Contour lines are a kind of isogram. tree →
• «Isogram» itself is an isogram! tree →

Note

Countable. Say «EYE-so-gram». «Iso» means equal and «gram» means something written or drawn. Check carefully: capital letters count the same as small ones.