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There are 4 eight-letter words beginning with SIDER

SIDERATE	• siderate n. A plant that is grown alongside a crop in order to improve its growth; A companion crop. • siderate v. To strike down or incapacitate. • SIDERATE v. to blast or strike.
SIDEREAL	• sidereal adj. Of or relating to the stars. • sidereal adj. (Astronomy) Relating to a measurement of time relative to the position of the stars. • sidereal adj. (Astronomy) Relating to a measurement of time relative to the point of the vernal equinox.
SIDERITE	• siderite n. (Uncountable, mineralogy) a widespread brown mineral, FeCO₃, having the structure of calcite. • siderite n. (Countable) an iron meteorite. • siderite n. An indigo-blue variety of quartz.
SIDEROAD	• sideroad n. A lesser road leading off a main road. • side␣road n. Alternative form of sideroad. • SIDEROAD n. a byroad.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

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See this list for:

English Wiktionary: 10 words
Scrabble in French: 12 words
Scrabble in Spanish: 4 words
Scrabble in Italian: 7 words
Scrabble in German: 2 words
Scrabble in Romanian: 18 words

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