Etymology
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polymorphism (n.)

"capability of existing in different forms;" in zoology, "difference of form, structure, or type," 1839, from polymorph + -ism.

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breakwater (n.)
"any structure serving to break the force of waves and protect a harbor or shore," 1721, from break (v.) + water (n.1).
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conus (n.)

1878, "a conical structure or organ," from Latin conus "cone" (see cone). Also the name of the typical genus of the cone-shells.

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scaffolding (n.)

"frame or structure for temporary support in construction, etc.," mid-14c.; see scaffold. Scaffoldage is from c. 1600.

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ontic (adj.)

a word in philosophy, variously defined but in general "pertaining to the existence of structure in an entity," 1949, from onto- + -ic.

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spirillum (n.)
(plural spirilla), 1875, Modern Latin, diminutive of Latin spira (see spiral (adj.)). So called for their structure.
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staging (n.)
"temporary structure or support," early 14c., verbal noun from stage (v.). As an adjective to designate "stopping place or assembly point," 1945.
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declasse (adj.)

"having lost one's place in the social order," 1887, from French déclassé, past participle of déclasser "to cause to lose class," from de-, privative prefix (see de-) + classer "to class," from classe (n.), from Latin classis  (see class (n.)). In italics in English until c. 1920; nativized form declassed is attested from 1873.

Fallen or put out of one's proper class or place or any definite and recognized position or rank in the social system: applied to persons who by misfortune or their own fault have lost social or business standing, and are not counted as part of any recognize class of society. [Century Dictionary, 1897]
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substructure (n.)
1726, "foundation, part of a building which supports another part," from sub- + structure (n.). Earlier in this sense was substruction (1620s). Related: Substructural.
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corn-crib (n.)

"ventilated structure with slat sides used to store unshelled maize," 1804, American English, from corn (n.1) + crib (n.).

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