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There are 7 twelve-letter words containing SECO

DISECONOMIES	• diseconomies n. Plural of diseconomy. • DISECONOMY n. lack of economy; a factor responsible for an increase in cost.
FEMTOSECONDS	• femtoseconds n. Plural of femtosecond. • FEMTOSECOND n. one quadrillionth part of a second.
MICROSECONDS	• microseconds n. Plural of microsecond. • MICROSECOND n. one millionth of a second.
MILLISECONDS	• milliseconds n. Plural of millisecond. • MILLISECOND n. a thousandth part of a second.
SECOBARBITAL	• secobarbital n. (Pharmacology) A barbiturate C₁₂H₁₈N₂O₃ that is used chiefly in the form of its bitter hygroscopic sodium… • SECOBARBITAL n. a barbiturate used chiefly as a hypnotic and sedative.
YOCTOSECONDS	• yoctoseconds n. Plural of yoctosecond. • YOCTOSECOND n. a very small unit of time.
ZEPTOSECONDS	• zeptoseconds n. Plural of zeptosecond. • ZEPTOSECOND n. a 10 to the -21 part of a second.

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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English Wiktionary: 88 words
Scrabble in French: 14 words
Scrabble in Spanish: no word
Scrabble in Italian: 63 words
Scrabble in German: no word
Scrabble in Romanian: 7 words

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