Here you’ll find 12 Prefixes that start with X, organized from “xanth-” to “xylo-“. These prefixes are mostly Greek or scientific, and appear in medicine, biology, and descriptive terms.

Prefixes that start with X are short word parts placed before bases to change or refine meaning. Notably, many came into English through Greek, especially in scientific naming and technical vocabulary.

Below you’ll find the table with Prefix, Origin, Meaning, Example words, Notes, and Source.

Prefix: The prefix form in quotes, so you can spot its exact spelling and usage.

Origin: The language root and brief etymology, helping you trace historical background and word-building patterns.

Meaning: A concise, three-to-seven-word gloss that gives the core semantic contribution of the prefix.

Example words: Two to four clear words showing how the prefix changes meaning in real usage.

Notes: Short usage tips, register, or variants to watch for when you apply the prefix in writing.

Source: Compact citation or link to a reliable dictionary or glossary for further verification and study.

Prefixes that start with X

PrefixOriginMeaningExamples
xeno-Greekforeign, strangerxenophobia,xenograft,xenogenesis
xen-Greekforeign, strangerxenophobia,xenophile,xenial
xylo-Greekwoodxylophone,xylem,xylography
xyl-Greekwoodxylan,xylitol,xylem
xero-Greekdryxerography,xerophyte,xerosis
xer-Greekdryxeric,xeroderma,xerophile
xantho-Greekyellowxanthophyll,xanthoma,xanthine
xanth-Greekyellowxanthoma,xanthic,xanthophyll
xipho-Greeksword-shapedxiphoid,xiphisternum,xiphosura
xiph-Greeksword-shapedxiphoid,xiphisternum,xiphosura
xyleno-Modernderived from xylenexylenol,xylenyl,para-xylenol
xenobi-Greekforeign to living organismsxenobiotic,xenobiology,xenobiome

Descriptions

xeno-
Widely used combining form in biology, medicine, and social terms to mean “foreign.” Very productive; variant xen- appears before vowels in some formations.
xen-
Orthographic variant of xeno- often found before vowels or in specific words; less often cited as a separate combining form.
xylo-
Common in biology, music, and woodworking terms; denotes “wood” or wood-derived substances. Variant xyl- also occurs.
xyl-
Shorter combining form appearing in chemistry and biology, especially for polysaccharides and compounds derived from wood.
xero-
Used in ecology, medicine, and technology to indicate dryness. Appears as xer- in some adjectives like “xeric.”
xer-
Short form or variant of xero- used before consonants; common in technical and medical vocabulary.
xantho-
Frequent in biochemistry and biology for yellow pigments or compounds; orthographic variant xanth- also common.
xanth-
Consonant-initial variant of xantho- appearing in many scientific names and descriptors.
xipho-
Anatomical and zoological combining form from Greek xiphos “sword”; used for structures with a swordlike shape.
xiph-
Shortened variant of xipho- used in some anatomical terms and taxonomic names.
xyleno-
Chemical combining form from the solvent xylene; used in organic nomenclature to indicate a xylene-derived substituent or group.
xenobi-
Stable composite combining form (xeno- + bio-) used in toxicology, pharmacology, and environmental science.
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