lacto-

Spanish, prefix

lacto- is spelled L-A-C-T-O (5 letters) and appears about once in every 27 million words in written Spanish, the 187,919th most frequent Spanish word form (wordfreq, 2021 data). Lacto- is a Spanish prefix meaning “lacto-” (English Wiktionary, September 2026). On this page, lacto is a different word: “first-person singular present indicative of lactar”. On this page, lactó is a different word: “third-person singular preterite indicative of lactar”.