-oid

From Ancient Greek -ειδής (-eidḗs), -οειδής (-oeidḗs) (the ο being the last vowel of the stem to which the suffix is attached); from εἶδος (eîdos, “form, likeness”).

• IPA^(key): /-ɔɪd/

-oid

1. Of similar form to, but not the same as. Having the likeness of. Forms adjectives and nouns.

   ‎human + ‎-oid → ‎humanoid

   ‎sterol + ‎-oid → ‎steroid

• -like

• DIO, DOI, I do, IOD, Ido, ODI, iod-

• -oide, -oides (sometimes for substantives)
• -id

From Latin -oides, from Greek -οειδής (-oeidḗs), from εἶδος (eîdos)

• Audio

  (file)

-oid

1. -oid (adjective or substantive)

• The gender of nouns in -oid often is the same as the one from the basic word: Asteroid is masculine like ἀστήρ (astḗr) and also like Stern, Metalloid is neuter like metallum and Metall. However, Ellipsoid is neuter while ellipsis and Ellipse are feminine, yet Ellipsoide is feminine too.
• Common declensions of substantives are:

  genitive singular -en, nominative plural -en, gender m. (e.g. Android, Asteroid, Meteoroid)

  genitive singular -[e]s, nominative plural -e, gender n. (e.g. Alkaloid, Metalloid)

• -ähnlich, -artig, -förmig, -oidisch (adjectives)

• adjectives: adenoid, albuminoid, amöboid, amygdaloid, amyloid, anthropoid, arachnoid, australoid, brakteoid, bulboid, diphtheroid, ellipsoid, epileptoid, grippoid, histioid & histoid, humanoid, hyaloid, hypnoid, hysteroid, indigoid, kretinoid, lichenoid, lipoid, lymphoid, mastoid, mongoloid, negroid, organoid, osteoid, ovoid, petaloid, pithekoid, polypoid, präfixoid, rheumatoid, rhizoid, rhomboid, sarkoid, schimpansoid, schizoid, suffixoid, systemoid, tigroid, zykloid
• masculine substantives: Android, Anthropoid, Asteroid, Humanoid, Meteoroid, Parasitoid, Planetoid, Rhomboid
• masculine or neuter substantives: Porphyroid
• neuter substantives: Affixoid, Albuminoid, Alkaloid, Amyloid, Bakterioid, Dermoid, Desmoid, Digitaloid, Ekzematoid, Ellipsoid, Eutektoid, Feldspatoid, Flavonoid, Globoid, Gruppoid, Haloid, Hyperboloid, Karotinoid (Carotinoid), Kankroid, Karzinoid, Keloid, Kolloid, Konoid, Kristalloid, Lanthanoid, Lipoid, Metalloid, Nukleoid, Opioid, Organoid, Paraboloid, Phelloid, Platinoid, Präfixoid, Prismatoid & Prismoid, Psychoid, Pyrenoid, Pyrethroid, Resinoid, Rheumatoid, Rhizoid, Rhomboid, Sigmoid, Solenoid, Sphäroid, Sphenoid, Suffixoid, Syphiloid, Systemoid, Toxoid, Trapezoid, Typhoid, Viroid, Zebroid, Zelluloid (Celluloid)
• adjectives suffixed with -oid or -id: myeloid, paranoid, schizoid
• neuter substantives with -oid or -id: Dermoid, Desmoid, Haloid, Pinakoid, Steroid
• adjectives suffixed with -id: australid, europid, mongolid, negrid
• neuter substantives suffixed with -id: Amid, Geoid, Halogenid, Ureid

See also: