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bivalent (adj.)
[bivalent 词源字典]
1864, of chemicals, 1899, of chromosomes, from
bi-
+
-valent
, from Latin
valentem
, present participle of
valere
"be worth" (see
valiant
).
[bivalent etymology, bivalent origin, 英语词源]
[bivalent 词源字典]