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septic tank an underground tank in which solid organic waste material is decomposed by anaerobic bacteria.
septillion the number represented by the Arabic numeral 1024. [2 definitions]
septuagenarian one who is seventy years old or between seventy and eighty years old.
Septuagint a translation of the Old Testament from Hebrew into Greek, done in the third century B.C.
septum in biology, a thin membrane or other partition that separates two cavities or two masses of soft tissue.
septuple amounting to or containing seven. [3 definitions]
sepulcher a sacred vault for burial; tomb. [3 definitions]
sepulchral of, relating to, or serving as a sepulcher or tomb. [3 definitions]
sepulture the act of placing in a tomb or sepulcher; interment; burial.
sequacious following in a logical sequence.
sequel what follows afterwards, such as the next event in a series, esp. as it arises from previous events. [2 definitions]
sequela something that follows; result or consequence, esp. an abnormal or diseased condition that follows and usu. results from a previous illness.
sequence an arrangement or process in which one thing follows another; succession. [5 definitions]
sequent following in time or order; succeeding; subsequent. [3 definitions]
sequential forming or marked by a sequence of parts or units.
sequester to remove into protection and isolation; seclude. [2 definitions]
sequestrate in law, to seize (property); confiscate. [2 definitions]
sequestration the act of sequestering, or the condition of being sequestered. [3 definitions]
sequin a very small shiny flat disk usu. sewn in great numbers onto clothing as decoration.
sequoia either of two very large coniferous trees native to California; redwood or big tree.
sera a plural form of serum.