foci
Ellipse's defining pair
Foci is the plural of focus, used primarily in technical and academic contexts.
In geometry, an ellipse has two foci—points that define its shape.
In medicine, foci are localized sites of infection or disease: Multiple foci of inflammation appeared on the scan.
The Latinate plural sounds formal; focuses works in most everyday contexts.
Unreached bounding curve
- eccentricityUnconventional behavior or nature
- transverseExtending sideways across
- conjugateModify verbs grammatically
- directrixLine defining conic sections
conic · vertex · branch · rectangular · geometry · parametric · quadratic · locus
Unconventional behavior or nature
- directrixLine defining conic sections
- conicTapering to apex
- vertexPoint where edges converge
- orbitalRevolving around another
Kepler · perihelion · aphelion · locus · geometry · parametric · quadratic · elliptical
Light-focusing curved glass
- mirrorReflective viewing surface
- convergenceProcess of approaching sameness
- divergenceSeparation from common origin
- refractionWave bending between media
reflection · parabolic · concave · convex · aperture · beam · ray · optical
Sustained single-minded attention
- centerMiddle of anything
- fixationPersistent mental attachment
- gazeFixed, intent look
- targetObject of pursuit
priority · emphasis · spotlight · centerpoint · direction · aim · object · subject
asymptote
Unreached bounding curve
- eccentricityUnconventional behavior or nature
- transverseExtending sideways across
- conjugateModify verbs grammatically
directrix · conic · vertex · branch · rectangular · geometry · parametric · quadratic · locus · curve
eccentricity
Unconventional behavior or nature
orbital · Kepler · perihelion · aphelion · locus · geometry · parametric · quadratic · elliptical · axis
lens
Light-focusing curved glass
- mirrorReflective viewing surface
- convergenceProcess of approaching sameness
- divergenceSeparation from common origin
refraction · reflection · parabolic · concave · convex · aperture · beam · ray · optical · imaging
concentration
Sustained single-minded attention
target · priority · emphasis · spotlight · centerpoint · direction · aim · object · subject · concern
epicenter
Point above seismic origin
- seismicRelating to ground tremors
- hypocenterEarthquake's underground origin point
- ruptureViolent tearing apart
fault · origin · depth · magnitude · tremor · aftershock · P-wave · S-wave · tectonic · seismology
lesion
Area of pathological change
inflammation · abscess · outbreak · cluster · hotspot · transmission · contagion · endemic · epidemic · disease
- pluralsmen, women, feet, mice, geese
- orbital mechanicsorbital mechanics, eccentricity, inclination, apogee, perigee
- conic sectionsellipse, parabola, hyperbola, circle, conic section
fociperipheries
Outer boundary areas
margins · edges · outskirts · fringes · perimeters
focidistractions
Things disrupting concentration
tangents · sidelines · background · peripherals · afterthoughts
- out of focusIndistinct, poorly defined
- in focusOptically clear and defined
- focus onDirect attention toward
- stay focusedMaintain mental concentration
- focal pointCenter of interest
- laser focusIntense, undivided concentration
focus, focused, focusing, focal, focuses, unfocused, focussing, focussed, refocus