sentinel

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sentinelannal, channel, flannel, impanel, multichannel, panel •cracknel •grapnel, shrapnel •carnal •antennal, crenel, fennel, kennel •regnal •anal, decanal •adrenal, officinal, penal, renal, venal •signal, spignel •hymnal • cardinal • libidinal • ordinal •attitudinal, latitudinal, longitudinal •altitudinal •imaginal, paginal •marginal, submarginal •aboriginal • virginal • disciplinal •seminal •criminal, liminal, subliminal •abdominal, nominal, phenomenal, pronominal •noumenal •germinal, terminal •vaticinal, vicinal •sentinel • intestinal • Juvenaldoctrinal, final, semi-final, spinal, urinal, vaginal •quarterfinal •cantonal, O'Connell •cornel • nounal •atonal, Donal, hormonal, Monel, patronal, polytonal, tonal, zonal •motional •lagoonal, monsoonal, tribunal •communal •Chunnel, funnel, gunnel, gunwale, runnel, tunnel •autumnal • meridional •embryonal, Lionel •diagonal, heptagonal, hexagonal, octagonal, tetragonal •trigonal • orthogonal • occasional •divisional, provisional, visional •delusional, fusional, illusional •regional • original • coronal • arsenal •medicinal •impersonal, interpersonal, personal, transpersonal •irrational, national, passional, rational •factional, fractional, redactional, transactional •confessional, congressional, expressional, impressional, obsessional, processional, professional, progressional, recessional, secessional, sessional, successional •connectional, correctional, directional, interjectional, intersectional, sectional, unidirectional •ascensional, attentional, conventional, declensional, intentional, tensional, three-dimensional, two-dimensional •conceptional, exceptional, perceptional •durational, locational, oblational, relational, vocational •rotational •additional, positional, tuitional, volitional •fictional, jurisdictional •inscriptional • optional • proportional •devotional, emotional, notional, promotional •constitutional, evolutional, institutional, substitutional •constructional, fluxional, instructional •conjunctional, dysfunctional, functional, multifunctional •versional • seasonal •colonel, diurnal, eternal, external, fraternal, infernal, internal, journal, kernel, maternal, nocturnal, paternal, supernal, vernal

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sen·ti·nel / ˈsentn-əl/ • n. a soldier or guard whose job is to stand and keep watch. ∎ fig. something that appears to be standing guard or keeping watch. ∎  Med. a thing that acts as an indicator of the presence of disease: [as adj.] the first national HIV sentinel surveillance program in the developing world. • v. (-neled, -nel·ing; chiefly Brit. -nelled, -nel·ling) [tr.] station a soldier or guard by (a place) to keep watch: a wide course had been roped off and sentineled with police | fig. trees sentineled the trenches. PHRASES: stand sentinel (of a soldier) keep watch: soldiers stood sentinel with their muskets | fig. a tall round tower standing sentinel over the river.

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sentinel A datum that indicates some important state, usually in the context of input or output. For example, an end-of-data sentinel means all the data has been read. See also rogue value, flag.

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sentinel sentry; †duty of a sentry; †military watch-tower XVI; †(in full private s.) private soldier XVIII. — F. sentinelle — It. sentinella, of unkn. orig.
Hence vb. XVI.