MOTH-WING

PRONUNCIATION: (MAWTH-wing)

MEANING: adjective: Fragile or fleeting.
noun: Something fragile or fleeting.

ETYMOLOGY: From moth, from Old English moththe + wing, from Old Norse vængir, plural of vængr. Earliest documented use: 1823.
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BOTH-WING - affecting both upper and lower surfaces of a biplane wing

MYTH-WING - the alae of Icarus, Pegasus, et al.

MATH-WING - there's a whole building at MIT where every classroom is devoted to the study of numbers, algebra, geometry, and topology