sovda -sov-so'a- gismu

x1 is an egg/ovum/sperm/pollen/gamete of/from organism [mother/father] x2.

(poorly metaphorical only due to gender- and species- being unspecified): ovoid, oblate (= pevyso'aseltai, but better: claboi); egg, specifically female (= fetso'a), of a bird (= cpifetso'a, cpiso'a), of a chicken (= jipcyfetso'a, jipcyso'a. (but note that Lojban does not require specificity, just as English doesn't for either milk or eggs; "sovda" is fine for most contexts); If fertilized, then tsiju or tarbi. (cf. ganti, gutra, mamta, patfu, rorci, tsiju, lanbi, tarbi; also djine, konju for shape, tarbi)

In notes:

djine
x1 is a ring/annulus/torus/circle [shape/form] of material x2, inside diam. x3, outside diam. x4.
ganti
x1 is a/the testes/ovary/testicle/scrotum/balls/gonad/stamen/pistil [body-part] of x2, gender x3.
gutra
x1 is a/the womb/uterus [body-part] of x2; [metaphor: nourishing, protective, giving birth].
konju
x1 is a cone [shape/form] of material x2 with vertex x3.
lanbi
x1 is a quantity of protein/albumin of type x2 composed of amino acids (sequence/jo'u) x3 .
mamta
x1 is a mother of x2; x1 bears/mothers/acts maternally toward x2; [not necessarily biological].
patfu
x1 is a father of x2; x1 begets/sires/acts paternal towards x2; [not necessarily biological].
rorci
x1 engenders/procreates/begets x2 with coparent x3.
tarbi
x1 is an embryo/zygote/fetus/fertilized egg with mother x2, and father x3.
tsiju
x1(s) is/are (a) seed(s)/spore(s) [body-part] of organism x2 for producing offspring x3.
cagzai
z1 is a farmer's market selling z2, operated by farmers z3=c3.
cifydatka
d1=c1 is a duckling of species/breed d2=c2.
cpizda
z1 is a nest of bird z2=c1 of genus/species/etc. c2.
dalcange
c1 is a ranch at c2, of rancher c3 raising animals c4=d1.
fetyganti
x1 is an ovary of x2.
fipso'a
x1=s1 is a roe/spawn of fish x2=s2=f2
gancuktai
t1 is an ellipse (geometric form) of object/abstraction/manifestation t2 (object/abstract) wide in dimension x3=g2.
glevi'i
v1 (body) ejaculates v2 from source v3 via means/route v4.
nuljarso'a
x1=s1=j1 is a coddled/mollet egg of/from organism x2=s2.
pinseljupso'a
x1 is an omelette/ a flatly cooked egg from organism x2=s2, cooked by recipe x3=j3, flat relative to reference frame x4=p2
seljiclyso'a
x1 is a stirred/scrambled egg (cooking not implied) of organism x2=s2 stirred by x3=j1
sovykruji
k1 is made of/contains a quantity of custard.
tcejarso'a
x1=s1=j1 is a hard-boiled egg of/from organism x2=s2.
larva
x1 is an organism x2 at its larva stage of development
esperma
x1 is semen/sperm fluid/generative substance of male animal x2
omle
x1 is an omelette containing x2
uivda
x1 is an anthropomorphized sperm/ovum constantly happy by standard x2; x1 is an ummy/eggy