Dedication: 3/15/05

teneo, tentum: hold; contineo: restrain; obtineo: obtain; pertineo: pertain; retineo: hold back

abstain, abstainer, abstention, abstinence, abstinent, anal retentive, appertain, appurtenance, appurtenant, contain, containable, container, containerize, containment, content, contentable, contented, contentedly, contentedness, contentment, contents, contentual, continence, continent, continently, continental, continentalism, continentalist, continentality, continentalize, continently, continual, continually, continuance, continuant, continuation, continuative, continuator, continue, continued, continuedly, continuer, continuist, continuity, continuous, continuously, continuousness, continuum, co-tenancy, co-tenant, co-tenure, countenance, countenancer, countertenor, detain, detainable, detainee, detainer, detent, detente, detention, detentive, detinue, discontent, discontented, discontentedly, discontentment, discontinuance, discontinue, discontinuee, discontinuer, discontinuity, discontinuous, discontinuously, discontinuousness, discountenance, distenant, double entendre (Fr), double entente (Fr), entertain, entertainable, entertainer, entertaining, entertainingly, entertainment, impertinence, impertinency, impertinent, impertinently, incontinence, incontinent, incontinently, intercontinental, intracontinental, irretention, irretentive, lieut., lieutenancy, lieutenant, maintain, maintainable, maintainer, maintenance, malcontent, malcontentedly, microcontinent, nontenure, obtain, obtainability, obtainable, obtainer, obtainment, ostinato, pertain, pertaining, pertinacious, pertinaciously, pertinacity, pertinence, pertinency, pertinent, pertinently, rein, retain, retainer, retention, retentive, retentively, retentivity, retinue, scuba, self-contained, self-sustaining, sostenuto (It), souteneur (Fr), soutenu (Fr), subtenant, subtense, supercontinent, sustain, sustainable, sustainer, sustainment, sustenance, sustentation, sustentative, sustension, sustentive, table tennis, tenability, tenable, tenableness, tenace, tenacious, tenaciously, tenaciousness, tenacity, tenaculum, tenaille, tenaillon, tenalia, tenancy, tenant, tenantable, tenantless, tenantry, tenantship, tenement, tenemental, tenementary, tenet, tennies, tennis, tennisball, tenniscourt, tennis-player, tenon, tenor, tenorist, tenorless, tenoroon, tenurable, tenure, tenuto (It), transcontinental, unsustainable, unsustained, untenable, untenanted, water content

See OED note on rein.
tener: soft, immature

intenerate, overtender, tender (adj,vb: soften), tender-eyed, tenderfoot, tenderhearted, tenderize, tenderizer, tenderling, tenderloin, tenderly, tender-minded, tenderness, tenderometer, tendre (Fr), tendron, teneral

OLD maintains separate root. LS from tenuis; W2 from tendo.
tenuis: flimsy

attenuate, attenuatating, attenatation, attenuator, extenuate, extenuating, extenuation, extenuative, extenuator, extenuatory, tenuicostate, tenuiflorous, tenuifolious, tenuipede, tenuiroster, tenuis, tenuity, tenuous, tenuously, tenuousness