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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
γῆgê

“earth-like”

Geoid

Earth
γῆgê

“earth shaped”

Hyoid

Medicine
ὗhŷ

“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”