Etymology
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synapsis (n.)
plural synapses, 1895 in cellular biology, Modern Latin, from Greek synapsis "connection, junction" (see synapse).
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symbiotic (adj.)
1882, in biology, from stem of symbiosis + -ic. Of human activities from 1951. Related: Symbiotical; symbiotically.
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adaptability (n.)

"quality that renders adaptable," 1660s, from adapt + -ability. In modern use especially in evolutionary biology, "variability in respect to, or under the influence of, external conditions."

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vestigial (adj.)
1850, "like a mere trace of what has been," originally in biology, from vestige + -al (1).
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syncytial (adj.)
1895, "pertaining to a syncytium" (1877), Modern Latin, from Greek syn "together" (see syn-) + kytos "receptacle, vessel," used in biology for "cell" (see cyto-).
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suborder (n.)
also sub-order, 1807 in biology; 1834 in architecture, from sub- + order (n.). Related: Subordinal.
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arrested (adj.)

"halted, stopped," 1610s, past-participle adjective from arrest (v.). Arrested development is attested from 1859 in evolutionary biology.

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systemic (adj.)
1803, irregularly formed from system + -ic; used in medicine and biology for differentiation of meaning from systematic. Related: Systemically.
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cirrous (adj.)

1650s in biology, "having or resembling a tendril;" 1815 in meteorology, from Latin cirrus "lock of hair, tendril" (see cirrus) + -ous. Also sometimes cirrose.

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caconym (n.)

"a name rejected for linguistic reasons, bad nomenclature in botany or biology," 1888, from caco- "bad, ill, poor" + -onym "name" (from PIE root *no-men- "name").

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