"milky appearance," 1680s, from lactescent "becoming milky" (1660s), from Latin lactescentem (nominative lactescens), present participle of lactescere, inchoative of lactere "to be milky," from lac "milk" (from PIE root *g(a)lag- "milk").
lacrosse
lacrymatory
lactate
lactation
lacteal
lactescence
lactic
lactivorous
lacto-
lactose
lacuna