Dedication: 3/15/05

sestertius: see ter
seta: silk

satin, satiny

s(a)eta: bristle

seta, setaceous, setarious, setiform, setigerous, seton, setose, setula, setule, ultrasetaceous

severus: stern, strict

asseverate, asseveration, perseverance, perseverate, perseveration, persevere, perseveringly, severe, severely, severitude, severity

LS refers to serius; OLD suggests perhaps verus.
sex: six; sextus: sixth (cf. ex)

bissextile, seicento (It), semester, semestrial, senary, senocular, senoculate, sestet, sestina, sexagenarian, sexagenary, sexagene, Sexagesima, sexagesimal, sexcentenary, sexdigitate, sexennial, sexennium, sexfid, sexfoil, sexipede, sexpartite, sexradiate, sext, sextal, sextan, sextant, sextary, sextern, sextet, sextic, sextile, sextillion, sexto, sextuple, sextuplet, sextuplex, sextuplicate, sice, siesta, sistine

sexus: sex

asexual, asexually, bisexual, bisexuality, cybersex, desex, desexualize, desexualization, hetrosexist, heterosexual, heterosexuality, homosexual, homosexualism, homosexuality, intersex, intersexual, metrosexual, monosexual, nonsexist, oversexed, pansexual, parasexual, presexual, pseudosex, psychosexual, psychosexually, retrosexual, sex, sex act, sex appeal, sexational, sex attractant, sex blind, sex bomb, sexcapade, sex cell, sex change, sex chromosome, sex crime, sex drive, sexduction, sexed, sex education, sex factor, sex free, sex hormone, sexiferous, sex impulse, sex instinct, sexism, sexist, sex killer, sex kitten, sexless, sex limited, sex linked, sex manual, sex object, sex-offender, sex-offense, sexologist, sexology, sex organ, sex orgy, sex party, sexpert, sex play, sexploitation, sexpot, sex ratio, sex shop, sex surrogate, sex symbol, sex therapy, sex type, sexual, sexual athlete, sexual intercourse, sexualism, sexualist, sexuality, sexualization, sexualize, sexually, sexual revolution, sexuate, sexuparous, sex urge, sexy, supersexual, transexual, transexualism, transexuality, undersexed, unisex, unisexual, unisexuality, unsex, unsexual

LS derives sexus from seco; OLD does not.