He was born at home in Toledo on March 10, 1875, and he died on August 11, 1875. Thanks to a kind genealogy person on the Ohio Genealogy FB page, I learned that "cholera infantum" was often the term listed on death certs of young children who actually died of diarrhea or dysentery.
Why did hubby's great-granddaddy and great-grandma name their child after a young man in an ancient tragedy?
Leander was a mythological figure who fell in love with Hero and swam across the straights every night to be with her, his way lit by a lantern she set up to guide him. One stormy night, the lantern light was blown out and heavy waves took Leander further and further, sweeping him away, to Hero's great sorrow. In despair, she threw herself after him and perished as well.
Even allowing for the fact that Thomas and Mary had named 16 other children by that time (their first was born in 1846!), Leander doesn't seem an obvious choice as a given name. Especially since one of their other children, Thomas Jefferson Isaiah Haskell Wood, drowned in May, 1861, before his 13th birthday.
RIP, little Leander Elkanah Wood.