Etymology
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hygro- 
word-forming element meaning "wet, moist; moisture," from Greek hygros "wet, moist, fluid; weak, soft, flexible." Beekes says possible cognates include Old Norse vokr (accusative vokvan) "moist, wet;" Latin uvidus, udus.
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masto- 

before vowels mast-, word-forming element meaning "female breast, mammary gland," from Greek mastos "woman's breast," from madan "to be wet, to flow," from PIE *mad- "wet, moist, dripping" (source also of Latin madere "be moist;" Albanian mend "suckle;" see mast (n.2)).

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