oogonium /ō-ə-gōˈni-əm/ noun (pl oogoˈnia)

1. (Gr gonos offspring) the female reproductive organ in seaweeds and fungi
2. An immature female gamete that gives rise to oocytes

oolite /ōˈə-līt/ noun (Gr lithos a stone; geology)

1. A kind of limestone composed of grains like the eggs or roe of a fish
2. (with cap) stratigraphically the upper part of the Jurassic in Britain, consisting largely of oolites

oolith /ōˈə-lith/ noun (Gr lithos a stone; geology)

Any of the tiny spherical grains of which oolite is composed

oolitic /ō-ə-litˈik/ adjective

oologˈical adjective

oolˈogist noun

oology /ō-olˈə-ji/ noun

(see -logy) the science or study of birds' eggs

oˈophyte /ōˈə-fīt/ noun

(see -phyte under phyt-) in ferns and mosses, the gametophyte

oosphere /ōˈə-sfēr/ noun

(Gr sphaira sphere) an unfertilized ovum

oospore /ōˈə-spōr or -spör/ noun

(Gr sporos seed) a zygote, esp a resting zygote

ootheca /ō-ə-thēˈkə/ (pl ootheˈcae /-kē/) noun

(Gr thēkē receptacle) a case containing the eggs of some insects

ootid /ōˈə-tid/ noun

An immature female gamete that develops into an ovum