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εἶδος

eîdos

form, shape

22 words in English grow from this root.

Adenoid

Medicine
ἀδήνadḗn

gland shaped

Android

Science
ἀνδρο-andro-

man-shaped

Asteroid

Earth
ἀστήρastḗr

star-shaped

Colloid

Science
κόλλαkólla

glue-like

Deltoid

Medicine
δέλταdélta

delta shaped

Ethmoid

Medicine
ἠθμόςēthmós

sieve-shaped

Ganoid

Nature
γάνοςgános

shining in form

Geode

Earth
γῆ

earth-like

Geoid

Earth
γῆ

earth shaped

Hyoid

Medicine

upsilon shaped

Idyll

Art
εἰδύλλιονeidúllion

little form, small picture

Kaleidoscope

Everyday
καλόςkalós

beautiful-form viewer

Mastoid

Medicine
μαστόςmastós

breast shaped

Metalloid

Science
μέταλλονmétallon

metal-shaped

Meteoroid

Earth
μετέωροςmetéōros

shaped like a thing aloft

Monoid

Number
μόνοςmónos

single-form thing

Nematode

Nature
νῆμαnêma

thread-shaped

Solenoid

Science
σωλήνsōlḗn

pipe-shaped thing

Sphenoid

Medicine
σφήνsphḗn

wedge shaped

Steroid

Science
στερεόςstereós

solid-shaped

Thyroid

Medicine
θυρεόςthyreós

shield-shaped

Trapezoid

Number
τράπεζαtrápeza

table-shaped