- sheath + -less (Wiktionary)
“The team first creates many "sheathless" copies of the enzyme, which are modified to function only in the presence of a triggering molecule such as fluoride.”
“A sheathless scimitar was thrust through his belt and his tunic bore dark stains of blood and sweat.”
“Of creatures that can fly and are bloodless some are coleopterous or sheath-winged, for they have their wings in a sheath or shard, like the cockchafer and the dung-beetle; others are sheathless, and of these latter some are dipterous and some tetrapterous: tetrapterous, such as are comparatively large or have their stings in the tail, dipterous, such as are comparatively small or have their stings in front.”
“Two things he noticed at once: The barbarian was pulling his sword-a new blade, from its look-and at his side he carried Lemparius's curved knife, sheathless, through his belt!”
“Maeonian king, and sent to Troy in forbidden weapons, lightly armed with sheathless sword and white unemblazoned shield.”
“His sheathless sword shall smite at last; he waits and knits”
“We threw off our shoes, wallets and cloaks, tucked up our tunics and, staffs in one hand and sheathless knives in the other, barefoot, raced back along the track after the guiding dog.”
“Willingly, willingly; but what is this?" exclaimed the cutler, as Arvina unbuckling his toga and suffering it to drop on the ground, stood clad in his succinct and snow-white tunic only, girded about him with a zone of purple leather, in which was stuck the sheathless dirk of Cataline.”
“14. sheathe - in both MSS., but I can only make sense of sheath -, i.e. sheathless and shelterless.”
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A roster of adjectives that infrequently surface in typical conversation and writing. Many are dredged from scientific or other technical jargon or sieved from examples of disused archaic forms.
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