Etymology
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Words related to *sed-

supersede (v.)

mid-15c., Scottish, "postpone, defer," from French superceder "desist, delay, defer," from Latin supersedere literally "sit on top of;" also, with ablative, "stay clear of, abstain from, forbear, refrain from," from super "above" (see super-) + sedere "to sit," from PIE root *sed- (1) "to sit." Meaning "displace, replace" first recorded 1640s. Related: Superseded; superseding.

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surcease (v.)

early 15c., "cease from an action, desist," from Anglo-French surseser, Old French sursis, past participle of surseoir "to refrain, delay," from Latin supersedere "forbear, refrain or desist from" (see supersede). The English spelling with -c- was influenced by the unrelated verb cease. As a noun from 1580s.

tanist (n.)

"elected heir of a Celtic chief," 1530s, from Gaelic tanaiste "presumptive or apparent heir to a lord," literally "parallel, second," from Old Irish tanaise "designated successor," from Celtic *tani-hessio- "one who is waited for."

tetrahedron (n.)

"triangular pyramid, solid figure contained by four triangular surfaces," 1560s, from Late Greek tetraedron, noun use of neuter of tetraedros (adj.) "four-sided," from tetra- "four" (from PIE root *kwetwer- "four") + hedra "seat, base, chair, face of a geometric solid," from PIE root *sed- (1) "to sit." Related: Tetrahedral.

Upanishad (n.)

one of a class of speculative treatises in Sanskrit literature, 1805, from Sanskrit upa-nishad, literally "a sitting down beside." From upa "near to" (from PIE root *upo "under," also "up from under," hence also "over") + ni-shad "to sit or lie down," from ni "downward" (from PIE *ni-, see nether) + -sad "sitting," from PIE root *sed- (1) "to sit."

decahedron (n.)

in geometry, "a solid having ten faces," 1828, from deca- "ten" + -hedron, from Greek hedra "seat, base, chair, face of a geometric solid," from PIE root *sed- (1) "to sit."  Related: Decahedral.

dissidence (n.)

"difference or separation in opinion," 1650s, from Latin dissidentia "diversity, contrariety," from dissidens, present participle of dissidere "to be remote; disagree, be removed from," literally "to sit apart," from dis- "apart" (see dis-) + sedere "to sit," from PIE root *sed- (1) "to sit."

sedation (n.)

early 15c. (Chauliac), sedacioun, "act or process of alleviation of pain;" 1540s, "act of making calm," from French sédation and directly from Latin sedationem (nominative sedatio) "a quieting, assuaging, a calming," noun of action from past-participle stem of sedare "to settle, make calm," causative of sedere "to sit" (from PIE root *sed- (1) "to sit").

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