solar telescope

noun 0.742

refracting telescope

noun 0.741

riflescope

noun 0.737

radio telescope

noun 0.725

reflecting telescope

noun 0.715

microscope

noun 0.698

observatory

noun 0.686

telephoto

noun 0.660

television

noun 0.638

periscope

noun 0.624

spyglass

noun 0.623

theodolite

noun 0.618

telemeter

noun 0.616

endoscope

noun 0.615

telescoping

noun 0.614

ophthalmoscope

noun 0.611

oscilloscope

noun 0.607

spectroscope

noun 0.596

otoscope

noun 0.594

interferometer

noun 0.589

pair of binoculars

noun 0.587

space satellite

noun 0.587

tele

noun 0.587

stereoscope

noun 0.586

television set

noun 0.586

televisor

noun 0.585

optical astronomy

noun 0.584

optics

noun 0.583

lens

noun 0.581

telemetry

noun 0.578

astronomer

noun 0.577

kaleidoscope

noun 0.577

optical microscope

noun 0.576

refractor

noun 0.575

stethoscope

noun 0.574

astrolabe

noun 0.574

teapot

noun 0.572

magnifying glass

noun 0.570

telescreen

noun 0.565

long lens

noun 0.565

camera

noun 0.564

planetarium

noun 0.564

eyepiece

noun 0.564

tea

noun 0.563

light microscope

noun 0.563

antenna

noun 0.562

thermometer

noun 0.554

celestial object

noun 0.554

compound microscope

noun 0.552

electron tube

noun 0.552

projector

noun 0.551

speculum

noun 0.550

telegraph

noun 0.549

compound eye

noun 0.548

borescope

noun 0.548

simple microscope

noun 0.546

proctoscope

noun 0.542

teaspoon

noun 0.542

microscopy

noun 0.541

telephone

noun 0.539

camera obscura

noun 0.539

electron microscope

noun 0.538

sextant

noun 0.536

space technology

noun 0.535

observation deck

noun 0.533

magnifier

noun 0.533

thermoscope

noun 0.530

tee

noun 0.530

optical

noun 0.529

gravitational lens

noun 0.529

telecon

noun 0.528

galileo

noun 0.528

globe

noun 0.526

eye

noun 0.526

galaxy

noun 0.526

electroscope

noun 0.525

dioptric

noun 0.525

aquarium

noun 0.525

teakettle

noun 0.524

fisheye

noun 0.523

tellurium

noun 0.522

star tracker

noun 0.522

spectrograph

noun 0.521

retinoscope

noun 0.521

ocular

noun 0.521

spectrometer

noun 0.521

laser

noun 0.520

stargazer

noun 0.519

fisheye lens

noun 0.519

observation car

noun 0.518

satellite television

noun 0.517

eyeglass

noun 0.517

spacecraft

noun 0.517

telomere

noun 0.517

gyroscope

noun 0.517

parabolic mirror

noun 0.516

resectoscope

noun 0.515

ometer

noun 0.515

aperture

noun 0.515

transit instrument

noun 0.514