The word is in the Wiktionary

2 short excerpts of Wiktionnary (A collaborative project to produce a free-content dictionary.)

— English words —

• Siderian adj. (Geology) Of a geologic period within the Paleoproterozoic era from about 2500 to 2300 million years ago.
• Siderian prop.n. (Geology) The Siderian period.

14 English words from 2 English definitions

about ago era from geologic Geology million Of␣a Paleoproterozoic period Siderian the within years

24 words-in-word (Words found as is inside the word. Minimum size 3 letters.)

der Der Der. Deri Eri. Ian -ian ide Ide IDE -ide Ider IDer ria RIA Rian sid Sid SID sid' side Side -side sider

26 words-in-word RTL (Words found written from right to left, inside the word. Minimum size 3 letters.)

air 'air aire Aire -aire aired dis dIs Dis DIs DIS 'dis dis- EDI Edis ire IrE IRE Ire. ired nai Nair red Red RED -red

6 anagrams (New words found by changing the order of the letters.)

arsinide diarsine draisine nidaries raisined rinse␣aid

21 anagrams found with an extra letter (New words formed with all the letters from the word and an extra letter.)

acridines adrenitis arsinides aspirined asterinid binarised diarsenic diarsines disdainer distearin dixnaries draisines Eridanids in␣diapers marinised meridians Mirandise neriaside resin␣acid rinse␣aids rodiasine

28 anagrams found minus a letter (New words formed with all the letters from the word minus a letter.)

Adriens airside Arnside dairies Dairsie denarii derains diaries diarise draines Draines Draisen Eridian Erisian indears insider irenids Isernia Naderis neriids randies reads␣in sandier sardine Sardine senarii Siniard sirenid

One cousin (New word found by changing only one letter.)

Siberian

Recommended websites

• Visit 1Word.ws - the word SIDERIAN is not a valid scrabble word.
• Visit www.BestWordClub.com - to play scrabble duplicate online.

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