Merriam-Webster's Dictionary and Thesaurus - Merriam-Webster [1586]
zoo·mor·phic adjective 1 : having the form of an animal
2 : of, relating to, or being the representation of a deity in the form or with the attributes of an animal
zoo·plank·ton noun : plankton composed of animals
zoo·spore noun : a motile spore
zoot suit noun : a flashy suit of extreme cut typically consisting of a thigh-length jacket with wide padded shoulders and pants that are wide at the top and narrow at the bottom
— zoot·suit·er noun
Zo·ro·as·tri·an·ism noun : a religion founded by the Persian prophet Zoroaster
— Zo·ro·as·tri·an adjective or noun
zounds interjection [ORIGIN: euphemism for God's wounds]
— used as a mild oath
zoy·sia noun : any of a genus of creeping perennial grasses having fine wiry leaves and including some used as lawn grasses
ZPG abbreviation zero population growth
Zr symbol zirconium
zuc·chet·to noun, plural -tos [ORIGIN: It]
: a small round skullcap worn by Roman Catholic ecclesiastics
zuc·chi·ni noun, plural -ni or -nis [ORIGIN: It]
: a smooth cylindrical usu. dark green summer squash; also : a plant that bears zucchini
Zu·lu noun, plural Zulu or Zulus : a member of a Bantu-speaking people of South Africa; also : the Bantu language of the Zulus
Zu·ni or Zu·ñi noun, plural Zuni or Zunis or Zuñi or Zuñis : a member of an American Indian people of western New Mexico; also : the language of the Zuni people
zwie·back noun [ORIGIN: G, lit., twice baked, fr. zwie- twice + backen to bake]
: a usu. sweetened bread that is baked and then sliced and toasted until dry and crisp
Zwing·li·an adjective : of or relating to the Swiss religious reformer Ulrich Zwingli or his teachings
— Zwinglian noun
zy·de·co noun : popular music of southern Louisiana that combines tunes of French origin with elements of Caribbean music and the blues
zy·gote noun : a cell formed by the union of two sexual cells; also : the developing individual produced from such a cell
— zy·got·ic adjective