| BENTHONIC | • benthonic adj. Synonym of benthic. • BENTHONIC adj. living on the sea bottom, also BENTHAL, BENTHIC, BENTHOAL. |
| CHTHONIAN | • chthonian adj. Pertaining to the underworld; being beneath the earth. • chthonian n. A dweller in the mythical underworld. • CHTHONIAN adj. pertaining to the earth or the underworld, also CHTHONIC. |
| DANTHONIA | • danthonia n. (Botany) Any of the genus Danthonia of Eurasian, North African, and American grasses. • DANTHONIA n. a tufted grass native to Australia and New Zealand. |
| DIPHTHONG | • diphthong n. (Phonetics) A complex vowel sound that begins with the sound of one vowel and ends with the sound of… • diphthong n. (Rare) A vowel digraph or ligature. • DIPHTHONG n. a union of two vowels pronounced in one syllable. |
| ETHONONES | • ETHONONE n. a toxic gas. |
| GNATHONIC | • gnathonic adj. (Obsolete) Deceitful; flattering. • GNATHONIC adj. (obsolete) flattering, also GNATHONICAL. |
| MARATHONS | • marathons n. Plural of marathon. • MARATHON n. a long-distance race. |
| PAKTHONGS | • PAKTHONG n. (Chinese) a Chinese alloy of nickel, zinc, and copper, resembling German silver, also PACKFONG, PAKFONG, PAKTONG. |
| PHONATHON | • PHONATHON n. a telephone-based fundraising campaign. |
| PYTHONESS | • pythoness n. Alternative letter-case form of Pythoness. • pythoness n. A female soothsayer. • pythoness n. A female python. |
| RADIOTHON | • radiothon n. (Informal) An extended charity appeal on the radio. • RADIOTHON n. a marathon talk-in on radio. |
| TALKATHON | • talkathon n. A lengthy speech, discussion or debate. • TALKATHON n. a long talking session. |
| TELETHONS | • telethons n. Plural of telethon. • TELETHON n. an exceptionally long television programme to raise money for a charity or cause. |
| THONGIEST | • THONGY adj. resembling an item of clothing made from a strip of cloth. |
| TITHONIAS | • tithonias n. Plural of tithonia. • TITHONIA n. a tall herb. |
| TRILITHON | • trilithon n. A structure consisting of two stone pillars supporting a horizontal stone. • TRILITHON n. (Greek) a stone monument of two upright and one transverse slab, also TRILITH. |
| WALKATHON | • walkathon n. A long-distance walk, either as a race or in aid of charity. • WALKATHON n. a marathon walking event. |
| XANTHONES | • xanthones n. Plural of xanthone. • XANTHONE n. a ketone analogue of xanthene which forms the basis of various natural pigments. |