10 letters
- margravial20
- matricidal18
- mechanical23
- megafaunal21
- menarcheal20
- menopausal19
- meridional16
- mesodermal18
- metacarpal20
- metatarsal14
- methodical20
- microsomal20
- microtonal18
- millennial18
- millesimal19
- miracidial18
- monarchial20
- monitorial15
- monoclonal20
- monopodial19
- monumental20
- multiaxial23
- multifocal22
- multimodal20
- mutational16
- myocardial20
- natatorial12
- negational15
- neoliberal16
- nephridial18
- neuroglial16
- nonaccrual20
- noncapital19
- noncentral17
- nonethical18
- nonfactual20
- nonfederal17
- nongenital16
- noninitial14
- nonlexical24
- nonliteral14
- nonlogical19
- nonmarital16
- nonmedical20
- nonmusical20
- nonnatural15
- nonoptimal19
- nonrenewal17
- nonspatial16
- nonthermal18
- nontrivial17
- nontypical21
- nosocomial18
- notational13
- nutational14
- occasional18
- occidental19
- octahedral17
- ommatidial18
- oratorical14
- orchestral16
- organismal17
- ornamental16
- orthogonal16
- outgeneral15
- overbrutal19
- paradisial15
- paranoidal16
- paranormal18
- parapodial18
- parasexual22
- parenteral15
- paroxysmal26
- parricidal18
- pathetical19
- patricidal18
- pedimental19
- pennyroyal20
- pentagonal18
- perceptual21
- perihelial17
- perikaryal20
- periodical18
- periosteal14
- peripheral19
- peritoneal15
- phalangeal20
- phantasmal20
- pharyngeal21
- phenomenal21
- pheromonal20
- photomural20
- phthisical21
- plastidial16
- polyclonal22
- polyhedral20
- polynomial21
- pontifical21
- positional15
- postcoital17
- praetorial14
- preethical19
- prefrontal18
- pregenital17
- prelogical20
- premarital17
- premedical21
- prenuptial19
- prepuberal21
- primordial18
- prismoidal18
- procambial23
- procedural19
- proctorial17
- pronominal19
- prosodical18
- prostomial17
- protonemal18
- prototypal19
- proverbial21
- provincial22
- prudential17
- quadrantal23
- quadrivial26
- quixotical31
- rabbinical21
- reciprocal20
- regimental17
- relational13
- retroviral15
- rhetorical16
- rhomboidal20
- rhythmical23
- rotational12
- rudimental17
- sabbatical20
- sacerdotal15
- sarcosomal17
- sclerotial15
- scriptural18
- sculptural20
- seignorial14
- semantical18
- semestrial14
- semiannual17
- semifeudal19
- semiformal20
- semilethal17
- semipostal17
- senatorial12
- sentential13
- septennial16
- septicidal18
- sepulchral21
- sequential22
- simoniacal18
- simplicial21
- sincipital18
- sinoatrial12
- sinusoidal14
- solenoidal14
- solstitial12
- spermatial17
- sphenoidal18
- spheroidal17
- sponsorial15
- sporangial17
- sporicidal18
- stomodaeal15
- structural16
- subcentral19
- subcrustal19
- subglacial21
- subliminal20
- sublingual20
- submaximal28
- subminimal22
- submucosal22
- suboptimal21
- suborbital18
- subtextual23
- suprarenal16
- supravital19
- symbolical23
- symphyseal23
- symphysial23
- synchronal20
- synoptical20
- tangential15
- televisual17
- tetragonal14
- theatrical16
- theistical16
- theurgical19
- thimerosal16
- thiopental17
- tinctorial15
- torrential12
- tractional15
- transeptal15