Etymology
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Words related to karyo-

*kar- 

also *ker-, Proto-Indo-European root meaning "hard."

It forms all or part of: -ard; Bernard; cancer; canker; carcinogen; carcinoma; careen; chancre; -cracy; Gerard; hard; hardly; hardy; Leonard; Richard; standard.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit karkatah "crab," karkarah "hard;" Greek kratos "strength," kratys "strong;" "hard;" Old English heard, German hart "solid and firm, not soft."

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eukaryotic (adj.)
also eucaryotic, "characterized by well-defined cells (with nuclei and cell walls)," 1957, from French eucaryote (1925), from Greek eu "well, good" (see eu-) + karyon "nut, kernel" (see karyo-). Related: Eukaryote; eucaryote.
gillyflower (n.)
type of flowering plant, 1550s, folk etymology alteration (by association with unrelated flower) of gilofre "gillyflower" (late 14c.), originally "clove" (c. 1300), from Old French girofle "clove" (12c.), from Latin caryophyllon, from Greek karyophyllon "clove, nut leaf, dried flower bud of clove tree," from karyon "nut" (see karyo-) + phyllon "leaf" (from suffixed form of PIE root *bhel- (3) "to thrive, bloom"). The flower so named for its scent.
karyotype (n.)
chromosomal constitution of a cell, 1929, ultimately from Russian kariotip (1922); see karyo- + type. Related: Karyotypic.
prokaryote (n.)

"prokaryotic organism," 1963, from French procaryote (1925), from Greek pro "before" (see pro-) + karyon "nut, kernel" (see karyo-).