Etymology
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Words related to sire

*sen- 

Proto-Indo-European root meaning "old."

It forms all or part of: monseigneur; seignior; senate; senescent; seneschal; senicide; senile; senility; senior; seniority; senor; senora; senorita; shanachie; Shannon; signor; sir; sire; surly.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit sanah "old;" Avestan hana- "old," Old Persian hanata- "old age, lapse of time;" Armenian hin "old;" Greek enos "old, of last year;" Latin senilis "of old age," senex "old, old man;" Lithuanian senas "old," senis "an old man;" Gothic sineigs "old" (used only of persons), sinistra "elder, senior;" Old Norse sina "dry standing grass from the previous year;" Old Irish sen, Old Welsh hen "old."

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sir 

title of honor of a knight or baronet (until 17c. also a title of priests), c. 1300, a variant of sire (q.v.) that was used originally only in unstressed position. It is not an acronym of anything.

It was generalized as a respectful form of address by mid-14c., and eventually extended to all equals or used without regard for rank. It has been used as a salutation at the beginning of letters from early 15c. As a noun, "person of rank or importance," from 14c.

grandsire (n.)

"a grandfather," late 13c., from Anglo-French graunt sire; see grand- + sire (n.). From 19c. often in reference to animal lineages.

dam (n.1)

"barrier across a stream of water to obstruct its flow and raise its level," c. 1400 (early 13c. in surnames), probably from Old Norse dammr or Middle Dutch dam, both from Proto-Germanic *dammaz (source also of Old Frisian damm, German Damm), which is of unknown origin. Also perhaps in part from or reinforced by Old English verb fordemman "to stop up, block."