Also found in: Thesaurus, Medical, Encyclopedia, Wikipedia.
Related to pentad: Reynolds pentad


A group of five.

[Greek pentas, pentad-, group of five, from pente, five; see penkwe in Indo-European roots.]


1. (Mathematics) a group or series of five
2. (Mathematics) the number or sum of five
3. a period of five years
4. (Chemistry) chem a pentavalent element, atom, or radical
5. (Physical Geography) meteorol a period of five days
[C17: from Greek pentas group of five]


(ˈpɛn tæd)

1. a period of five years.
2. a group of five.
3. the number five.
4. a pentavalent element or group.
[1645–55; < Greek pentad- (s. of pentás) group of five. See pent-, -ad1]


 a group of five, especially five years, 1880.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.pentad - the cardinal number that is the sum of four and onepentad - the cardinal number that is the sum of four and one
digit, figure - one of the elements that collectively form a system of numeration; "0 and 1 are digits"
References in periodicals archive ?
For each grid and each pentad, a flash drought is defined as pentad-mean surface air temperature anomaly is larger than one standard deviation, the percentile of target pentad-mean soil moisture is lower than 40%, and the soil moisture percentile of target pentad is at least 10% lower than the preceding pentad.
When a pentad (g,[pi],U,U,B) satisfies the following conditions, we say that the pentad (g, [pi], U, U, B) is a standard pentad:
Luego de la extraccion y posterior determinacion de la calidad e integridad del ADN extraido de las muestras, se procedio a la amplificacion de las mismas a traves de la PCR multiplex, empleando el Kit Promega powerplex 16 (9), lo que permitio determinar las frecuencias alelicas de 15 marcadores STR s autosomicos D3S1358, TH01, D21S11, D18S51, PENTA E, D5S818, D13S317, D7S82O, D16S539, CSF1PO, PENTAD, VWA, D8S1179, TPOX, FGA y Amelogenina a traves de PCR.
You'll find the pentad just south-southeast of Gamma ([gamma]) Ursae Majoris and the oval barred spiral M109.
In the past, before the availability of plasmapheresis as an effective therapy for TTP, the diagnosis was based on the presence of pentad of microangiopathic hemolytic anemia, thrombocytopenia, neurologic andrenal abnormalities as well as fever.
But, the classic pentad (thrombocytopenia, anemia, fever, neurologic and renal abnormalities) was present in only a minority of cases (8.
The SPADE pentad (sleep-pain-anxiety-depression-energy/fatigue) is a particularly common cluster and most patients who have one of these symptoms have at least two to three of the others.
TTP was originally characterised by a pentad of thrombocytopenia, microangiopathic haemolytic anaemia, fluctuating neurological deficits, renal impairment and fever, often with insidious onset.
The supreme Buddha of the STTS is Vairochana, the fifth and unifying sun Buddha of the Vajradhatu pentad.
A unique radiological pentad of mesonephric duct abnormalities in a young man presenting with testicular swelling.
1) This syndrome is now a well recognized pentad including renal failure, microangiopathic hemolytic anemia, neurologic signs or symptoms, fever, and thrombocytopenia.
REACH Renewable and AOS Consulting Engineers designed the system which was co-implemented with Industrial Solar, Voltas Technologies and Luft Technik, and had the support of the professional team made of ISF Services, Classen Auret, Project Works, DSM and Pentad.