A Grammatical Dictionary of Botanical Latin

-ad, Eng. noun suffix in Gk. compounds [derived from Greek nouns ending in –as,-adis (s.f.III), q.v., abl.sg. –ade, denoting descent from or connection with; a collection of; something or someone associated with]; adj. -adicus,-a,-um (adj.A), Eng. adj. -“adic”, “-adicous”.

1. member of (such) a botanical group; a member (species) of a group of species, represented by the stem of the genus name:

Asclepiad: a member of the genus Asclepias,-adis (s.f.III) Linn.

Cycad: a member of the genus Cycas,-adis (s.f.III) Linn.

Magnoliad: a member of the genus Magnolia,-ae (s.f.I) Linn.

Moringad: a member of the genus Moringa,-ae (s.f.I) Adans.

2. group, aggregate, or unit of (so many) parts;

monad (from monas,-adis (s.f.III): a unit considered on its own (alone); the simplest unit or elementary particle; unity; > Gk. monas,-ados (s.f.III), (a special feminine of monos, solitary, alone, by oneself (esp. of a woman)); monas (s.f.III), a unit; in Pythagorean philosophy, to denote fire (Liddell & Scott).

dyad: consisting of two elements or parts: dyas,-adis (s.f.III), abl. sg. dyade, subdivision of a tetrad; a pair; the Gk. number two (Liddell & Scott); dyadicus,-a,-um (adj.A): dyadic (Eng. dyadal) relating to a dyad, or group of two; (of pollen) of pollen) "cohering and shed in pairs, each tetrad having separated into halves" (Kiger & Porter 2001).

triad: a group of set of three things considered as one unit; trias,-adis (s.f.III), the Gk. number three, triad (Liddell & Scott); see triad.

tetrad: a group of four; tetras,-ados (s.f.III), the number four; the fourth day of the month; the fourth day of the week, Wednesday; a space of four days; the four quarters of the moon (Liddell & Scott).

pentad” pentas,-ados (s.f.III): a group of five; the number five (Liddell & Scott): NOTE: a ‘quintad’ seems an inappropriate combination of a Latin prefix with a Gk. suffix].

hexad: (h)exas,-ados (s.f.III): the number six (Liddell & Scott).

heptad: (h)eptas,-ados (s.f.III), the number seven, a period of seven days; a period of seven years (Liddell & Scott).

octad: oktas,-ados (s.f.IIII): the number eight(Liddell & Scott).

ennead: enneas,-ados (s.f.III): a body of nine; the number nine; the ninth day of the month (Liddell & Scott).

decad: dekas,-ados (s.f.III): a company of ten; the number ten (Liddell & Scott).

Polyad, compound pollen grains, more than four in each group (Radford & Bell): polyas,-adis (s.f.III), abl.sg. polyade, nom. & acc. pl. polyades; also polyadum,-i (s.n.II), abl.sg. polyado, nom. & acc. pl. polyada, dat. & abl. pl. polyadis; adj. polyadicus,-a,-um (adj.A), i.e. polyadal, Eng. adj. for “pollen shed in many groups.”

3. variad: a subform of a phylogenetic stock or species, meaning it's a slightly differentiated variation or subform within a larger group: varias,-adis (s.f.III), abl.sg. variade.

4. -ad (noun suffix)> Gk. suffix -adEs, a patronymic suffix): a kind of plant or animal produced by or associated with; “used by Clements as an addition meaning ‘ecad’” (Jackson).

Ecad: (from Gk. oikos, a house) + ad) “a habitat form due to origin by adaptation (Clements)” (Jackson): ecas,-adis (s.f.III).

Agrad: (Gk. agros, a field), “a cultivated plant (Clements)” (Jackson): agras,-adis (s.f.III).

Drimad: (Gk. drimYs, pungent) “a plant of an alkaline formation” (Jackson).

NOTE: Drimium,-ii (s.n.II): “an alkali plain or salt basin formation” (Jackson) [drim- + -ium].

Driodad: (Gk. drios, a thicket) “a plant of a dry thicket” (Jackson).

NOTE: a Driodium,-ii (s.n.II), “a dry thicket formation (Clements); [driod- + ium].

Hydrad:(h)udOr (hydor) water + -AD, a hydrophyte (Clements): hydras,-adis (s.f.III).

Hydras, the “wet form” of a species (Clements).’ (Jackson).

Rhoad:(> Gk. rhoos, a stream, + ad (Jackson) “a creek plant” (Clements): rhoas,-adis (s.f.III).

Sciad: (from Gk. skia, shade, + ad) “a sciophyte” (Jackson): scias,-adis (s.f.III); NOTE: Scias (Eng.noun): a shade form of any plant (Clements)” (Jackson), seems to be formed from the nom.sg. of scias,-adis (s.f.III).

5. associated with wood (oak); associated with mountains (oros): dryad (Eng.noun): a wood-nymph: Dryad,-adis (s.f.III) > Gk. drys, (s.f.II), gen.sg. dryos, the oak.

oread (Eng.noun): a mountain-nymph: Oreas,-adis (s.f.III) > Gk. oros (s.m.II), a mountain.