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bilateral (adj.)
[bilateral 词源字典]
"having two sides," 1775, from
bi-
+
lateral
. Related:
Bilaterally
.
[bilateral etymology, bilateral origin, 英语词源]
pennate
"(Of a diatom) bilaterally symmetrical", Mid 19th century: from Latin
pennatus
'feathered, winged', from
penna
'feather'.