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 (hĕl′ĭ-sēz′, hē′lĭ-)
A plural of helix.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


a plural of helix
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈhi lɪks)

n., pl. hel•i•ces (ˈhɛl əˌsiz)
1. a spiral.
2. the curve formed by a straight line drawn on a plane when that plane is wrapped around a cylindrical surface, esp. a right circular cylinder, as the curve of a screw.
3. a spiral, scroll-like architectural ornament, as a volute on a Corinthian capital.
4. the curved fold forming most of the rim of the external ear.
[1555–65; < Latin: a spiral, a kind of ivy < Greek hélix anything twisted]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
"Double helices in synthetic systems are essentially unheard of."
Myoglobin (Mb) is a heme protein, and holomyoglobin (holoMb) is composed of eight helices (11) (Fig.
Although 3/10 helices play important roles in the folding of proteins (as parts of transmembrane helices, as interactive interfaces, as immunogenic epitopes, and as fragments of active centers), historically they were thought to be unstable and relatively rare [1, 2].
Metallic helices, which have been studied at least since 1920 [1], interest scientists today from a point of view of photonic crystal, metamaterial applications, as well as new broadband microwave and optical devices.
Yamadam, "Thermal/structural analysis of diamond supported helices," AIAA 11th Communication Satellite Systems Conference, 605-608, 1986.
Hacisalihoglu: Harmonic curvatures and generalized helices in [E.sup.n], Chaos, Solitons and Fractals, DOI 10.1016/j.chaos.2007.11.001.
The secondary protein structural model, based on hydrophobicity plots, proposes twelve [alpha] helices that cross the bilayer.
Stupp and his Northwestern coworkers Eli Sone and Eugene Zubarev made the templates for the cadmium sulfide helices from molecules dubbed dendron rodcoils.
The concept of a resonant, fractional-turn, quadrafilar helix (also known as a volute antenna) was first introduced by Kilgus.[1] It was shown that this antenna can produce a highly directive circularly polarized radiation pattern by feeding a proper complex excitation to the four helices. It was later shown[2] that a shaped-conical pattern also can be achieved by using helices of an integral number of turns and varying pitches.
Helices are one of the well-known chiral structures found in several natural molecules, e.g., DNA, sucrose, proteins, etc., as well as solid elements such as quartz and crystal.
When they used the program, the researchers were surprised to discover that their top candidates for containing beta helices were all bacterial proteins.
The antenna is a two-element broadside array consisting of two short helices mounted on a small common ground plane.