selci -sle- gismu

x₁ is a cell/atom/unit/molecule of x₂; x₁ is an indivisible, most basic subunit of x₂.

(x₂ generally has mass nature); (cf. kantu for properties, activities; ratni, gradu)

jbovlaste

In notes:

gradu: x₁ [magnitude] is a unit/degree of/on scale/reference standard x₂ (si'o) measuring property x₃.
kantu: x₁ is a quantum/ray/elementary particle/smallest measurable increment of property/activity x₂.
ratni: x₁ is an atom of element/atomic number x₂ of isotope number/atomic weight x₃.
bancocysle: s₁=c₁ is a linguistic-gesture unit/chereme [in analogy with phoneme; specifically, nonvocal] representing/that is recognized meaningful conceptual subunit underlying specific gestures/gesture-phones s₂ in language b₁ used by b₂ in order to communicate/express b₃=c₂ (si'o/du'u; not quote) made using body part/utensil/tool/locus c₃ by motion/action/means c₄
calsle: x₁ is a voxel of model/object x₂
gugypausle: s₁ is a county/district/parish/province (second-level administrative division) of country s₂=g₁.
jempausle: x₁ is an army brigade/regiment, a subdivision of army unit x₂ which serves country/nation/group x₃.
ji'esle: s₁=j₁ is a biological cell of s₂.
kinsle: x₁=s₁ is a frame from motion picture x₂=k₁ about x₃=k₂ [plot/theme/subject/activity]
mulna'usle: s₁=mn₁ is an indivisible / prime number in integer domain s₂.
rilsle: x₁ is the unit of a form of rhythm of x₂
rilsletei: x₁ is tempo of rhythmic movement x₂ with the unit x₃; x₁ is a time interval and corresponds to the unit x₃ of a form of rhythm of x₂.
selbrisle: x₁ is a tanru unit.
slemidju: x₁ is a nucleus of cell x₂ [default biological].
slepau: x₁=pagbu₁=selci₁ is an irreducible/fundamental/indivisible part or constituent or unit which partially composes whole x₂=pagbu₂.
songripausle: x₁ is an army platoon, a subdivision of army unit x₂ which serves country/nation/group x₃.
trupausle: s₁ is a sub-division of the Ministry/Department of t₂.
xumsle: s₁ is a molecule of chemical x₂.
elci: x₁ is a unit of x₂